{"id":220,"date":"2026-08-03T15:36:55","date_gmt":"2026-08-03T06:36:55","guid":{"rendered":"https:\/\/www.masmath.online\/?p=220"},"modified":"2026-08-03T15:54:52","modified_gmt":"2026-08-03T06:54:52","slug":"%e5%b1%95%e9%96%8b%e3%81%9d%e3%81%ae3","status":"publish","type":"post","link":"https:\/\/www.masmath.online\/?p=220","title":{"rendered":"\u5c55\u958b\u305d\u306e3"},"content":{"rendered":"\n<h2>\u30bb\u30c3\u30c8A \u2013 \u554f\u984c<\/h2>\n<p>\u6b21\u306e\u5f0f\u3092\u5c55\u958b\u305b\u3088\uff0e<\/p>\n<p>\n\\( (1) \\)\u3000\\( (x+3)^2 \\)<br>\n\\( (2) \\)\u3000\\( (x-5)^2 \\)<br>\n\\( (3) \\)\u3000\\( (x+7)(x-7) \\)<br>\n\\( (4) \\)\u3000\\( (x+2)(x+6) \\)<br>\n\\( (5) \\)\u3000\\( (2x+3)(3x-1) \\)<br>\n\\( (6) \\)\u3000\\( (x+y+1)^2 \\)<br>\n\\( (7) \\)\u3000\\( (x+2)^3 \\)<br>\n\\( (8) \\)\u3000\\( (x-3)^3 \\)<br>\n\\( (9) \\)\u3000\\( (x+2)(x^2-2x+4) \\)\n<\/p>\n\n<h2>\u30bb\u30c3\u30c8A \u2013 \u89e3\u7b54\u30fb\u89e3\u8aac<\/h2>\n<p>\\( (1) \\)\u3000\\( x^2+6x+9 \\)<br>\n\\( (a+b)^2=a^2+2ab+b^2 \\) \u306b \\( a=x,\\ b=3 \\) \u3092\u4ee3\u5165\u3002<\/p>\n\n<p>\\( (2) \\)\u3000\\( x^2-10x+25 \\)<br>\n\\( (a-b)^2=a^2-2ab+b^2 \\) \u306b \\( a=x,\\ b=5 \\) \u3092\u4ee3\u5165\u3002<\/p>\n\n<p>\\( (3) \\)\u3000\\( x^2-49 \\)<br>\n\\( (a+b)(a-b)=a^2-b^2 \\) \u306b \\( a=x,\\ b=7 \\) \u3092\u4ee3\u5165\u3002<\/p>\n\n<p>\\( (4) \\)\u3000\\( x^2+8x+12 \\)<br>\n\u548c\u304c \\( 8 \\)\u3001\u7a4d\u304c \\( 12 \\) \u3068\u306a\u308b\u516c\u5f0f\u306e\u78ba\u8a8d\u3002<\/p>\n\n<p>\\( (5) \\)\u3000\\( 6x^2+7x-3 \\)<br>\n\\( 2x\\cdot3x+2x\\cdot(-1)+3\\cdot3x+3\\cdot(-1)=6x^2-2x+9x-3 \\)<\/p>\n\n<p>\\( (6) \\)\u3000\\( x^2+y^2+1+2xy+2y+2x \\)<br>\n\\( (a+b+c)^2 \\) \u306b \\( a=x,\\ b=y,\\ c=1 \\) \u3092\u4ee3\u5165\u3002<\/p>\n\n<p>\\( (7) \\)\u3000\\( x^3+6x^2+12x+8 \\)<br>\n\\( (a+b)^3 \\) \u306b \\( a=x,\\ b=2 \\) \u3092\u4ee3\u5165\u3002<\/p>\n\n<p>\\( (8) \\)\u3000\\( x^3-9x^2+27x-27 \\)<br>\n\\( (a-b)^3 \\) \u306b \\( a=x,\\ b=3 \\) \u3092\u4ee3\u5165\u3002<\/p>\n\n<p>\\( (9) \\)\u3000\\( x^3+8 \\)<br>\n\\( (a+b)(a^2-ab+b^2)=a^3+b^3 \\) \u306b \\( a=x,\\ b=2 \\) \u3092\u4ee3\u5165\u3002<\/p>\n\n<hr>\n\n<h2>\u30bb\u30c3\u30c8B \u2013 \u554f\u984c<\/h2>\n<p>\u6b21\u306e\u5f0f\u3092\u5c55\u958b\u305b\u3088\uff0e<\/p>\n<p>\n\\( (1) \\)\u3000\\( (x+4)^2 \\)<br>\n\\( (2) \\)\u3000\\( (x-6)^2 \\)<br>\n\\( (3) \\)\u3000\\( (x+9)(x-9) \\)<br>\n\\( (4) \\)\u3000\\( (x+3)(x-5) \\)<br>\n\\( (5) \\)\u3000\\( (3x+2)(2x-5) \\)<br>\n\\( (6) \\)\u3000\\( (x+y+3)^2 \\)<br>\n\\( (7) \\)\u3000\\( (x+3)^3 \\)<br>\n\\( (8) \\)\u3000\\( (x-2)^3 \\)<br>\n\\( (9) \\)\u3000\\( (x-3)(x^2+3x+9) \\)\n<\/p>\n\n<h2>\u30bb\u30c3\u30c8B \u2013 \u89e3\u7b54\u30fb\u89e3\u8aac<\/h2>\n<p>\\( (1) \\)\u3000\\( x^2+8x+16 \\)<\/p>\n<p>\\( (2) \\)\u3000\\( x^2-12x+36 \\)<\/p>\n<p>\\( (3) \\)\u3000\\( x^2-81 \\)<\/p>\n<p>\\( (4) \\)\u3000\\( x^2-2x-15 \\)<br>\n\u548c \\( -2 \\)\u3001\u7a4d \\( -15 \\)\u3002<\/p>\n<p>\\( (5) \\)\u3000\\( 6x^2-11x-10 \\)<br>\n\\( 3x\\cdot2x+3x\\cdot(-5)+2\\cdot2x+2\\cdot(-5)=6x^2-15x+4x-10 \\)<\/p>\n<p>\\( (6) \\)\u3000\\( x^2+y^2+9+2xy+6y+6x \\)<\/p>\n<p>\\( (7) \\)\u3000\\( x^3+9x^2+27x+27 \\)<\/p>\n<p>\\( (8) \\)\u3000\\( x^3-6x^2+12x-8 \\)<\/p>\n<p>\\( (9) \\)\u3000\\( x^3-27 \\)<br>\n\\( (a-b)(a^2+ab+b^2)=a^3-b^3 \\) \u306b \\( a=x,\\ b=3 \\)\u3002<\/p>\n\n<hr>\n\n<h2>\u30bb\u30c3\u30c8C \u2013 \u554f\u984c<\/h2>\n<p>\u6b21\u306e\u5f0f\u3092\u5c55\u958b\u305b\u3088\uff0e<\/p>\n<p>\n\\( (1) \\)\u3000\\( (x+7)^2 \\)<br>\n\\( (2) \\)\u3000\\( (x-2)^2 \\)<br>\n\\( (3) \\)\u3000\\( (x+5)(x-5) \\)<br>\n\\( (4) \\)\u3000\\( (x-3)(x-8) \\)<br>\n\\( (5) \\)\u3000\\( (4x+1)(2x-3) \\)<br>\n\\( (6) \\)\u3000\\( (a-b+3)^2 \\)<br>\n\\( (7) \\)\u3000\\( (x+1)^3 \\)<br>\n\\( (8) \\)\u3000\\( (2x-1)^3 \\)<br>\n\\( (9) \\)\u3000\\( (x+4)(x^2-4x+16) \\)\n<\/p>\n\n<h2>\u30bb\u30c3\u30c8C \u2013 \u89e3\u7b54\u30fb\u89e3\u8aac<\/h2>\n<p>\\( (1) \\)\u3000\\( x^2+14x+49 \\)<\/p>\n<p>\\( (2) \\)\u3000\\( x^2-4x+4 \\)<\/p>\n<p>\\( (3) \\)\u3000\\( x^2-25 \\)<\/p>\n<p>\\( (4) \\)\u3000\\( x^2-11x+24 \\)<br>\n\u548c \\( -11 \\)\u3001\u7a4d \\( 24 \\)\u3002<\/p>\n<p>\\( (5) \\)\u3000\\( 8x^2-10x-3 \\)<br>\n\\( 4x\\cdot2x+4x\\cdot(-3)+1\\cdot2x+1\\cdot(-3)=8x^2-12x+2x-3 \\)<\/p>\n<p>\\( (6) \\)\u3000\\( a^2+b^2+9-2ab+6a-6b \\)<br>\n\\( p=a,\\ q=-b,\\ r=3 \\) \u3068\u3057\u3066 \\( (p+q+r)^2 \\) \u516c\u5f0f\u3092\u9069\u7528\u3002<\/p>\n<p>\\( (7) \\)\u3000\\( x^3+3x^2+3x+1 \\)<\/p>\n<p>\\( (8) \\)\u3000\\( 8x^3-12x^2+6x-1 \\)<br>\n\\( a=2x,\\ b=1 \\) \u3068\u3057\u3066 \\( a^3-3a^2b+3ab^2-b^3 \\)\u3002<\/p>\n<p>\\( (9) \\)\u3000\\( x^3+64 \\)<br>\n\\( a=x,\\ b=4 \\) \u306e \\( a^3+b^3 \\) \u516c\u5f0f\u3002<\/p>\n\n<hr>\n\n<h2>\u30bb\u30c3\u30c8D \u2013 \u554f\u984c<\/h2>\n<p>\u6b21\u306e\u5f0f\u3092\u5c55\u958b\u305b\u3088\uff0e<\/p>\n<p>\n\\( (1) \\)\u3000\\( (x+9)^2 \\)<br>\n\\( (2) \\)\u3000\\( (x-7)^2 \\)<br>\n\\( (3) \\)\u3000\\( (2x+3)(2x-3) \\)<br>\n\\( (4) \\)\u3000\\( (x-6)(x+2) \\)<br>\n\\( (5) \\)\u3000\\( (5x-2)(x+3) \\)<br>\n\\( (6) \\)\u3000\\( (x+2y-1)^2 \\)<br>\n\\( (7) \\)\u3000\\( (2x+1)^3 \\)<br>\n\\( (8) \\)\u3000\\( (x-5)^3 \\)<br>\n\\( (9) \\)\u3000\\( (2x-1)(4x^2+2x+1) \\)\n<\/p>\n\n<h2>\u30bb\u30c3\u30c8D \u2013 \u89e3\u7b54\u30fb\u89e3\u8aac<\/h2>\n<p>\\( (1) \\)\u3000\\( x^2+18x+81 \\)<\/p>\n<p>\\( (2) \\)\u3000\\( x^2-14x+49 \\)<\/p>\n<p>\\( (3) \\)\u3000\\( 4x^2-9 \\)<br>\n\\( a=2x,\\ b=3 \\) \u306e \\( a^2-b^2 \\)\u3002<\/p>\n<p>\\( (4) \\)\u3000\\( x^2-4x-12 \\)<br>\n\u548c \\( -4 \\)\u3001\u7a4d \\( -12 \\)\u3002<\/p>\n<p>\\( (5) \\)\u3000\\( 5x^2+13x-6 \\)<br>\n\\( 5x\\cdot x+5x\\cdot3+(-2)\\cdot x+(-2)\\cdot3=5x^2+15x-2x-6 \\)<\/p>\n<p>\\( (6) \\)\u3000\\( x^2+4y^2+1+4xy-4y-2x \\)<br>\n\\( p=x,\\ q=2y,\\ r=-1 \\) \u3068\u3057\u3066\u5c55\u958b\u3002<\/p>\n<p>\\( (7) \\)\u3000\\( 8x^3+12x^2+6x+1 \\)<br>\n\\( a=2x,\\ b=1 \\) \u306e \\( (a+b)^3 \\)\u3002<\/p>\n<p>\\( (8) \\)\u3000\\( x^3-15x^2+75x-125 \\)<\/p>\n<p>\\( (9) \\)\u3000\\( 8x^3-1 \\)<br>\n\\( a=2x,\\ b=1 \\) \u306e \\( a^3-b^3 \\) \u516c\u5f0f\u305d\u306e\u3082\u306e\u3002<\/p>\n\n<hr>\n\n<h2>\u30bb\u30c3\u30c8E \u2013 \u554f\u984c<\/h2>\n<p>\u6b21\u306e\u5f0f\u3092\u5c55\u958b\u305b\u3088\uff0e<\/p>\n<p>\n\\( (1) \\)\u3000\\( (x+6)^2 \\)<br>\n\\( (2) \\)\u3000\\( (x-9)^2 \\)<br>\n\\( (3) \\)\u3000\\( (3x+4)(3x-4) \\)<br>\n\\( (4) \\)\u3000\\( (x+4)(x-11) \\)<br>\n\\( (5) \\)\u3000\\( (2x+5)(3x-4) \\)<br>\n\\( (6) \\)\u3000\\( (2a-b+1)^2 \\)<br>\n\\( (7) \\)\u3000\\( (x-4)^3 \\)<br>\n\\( (8) \\)\u3000\\( (3x+1)^3 \\)<br>\n\\( (9) \\)\u3000\\( (x^2+x+1)(x^2-x+1) \\)\n<\/p>\n\n<h2>\u30bb\u30c3\u30c8E \u2013 \u89e3\u7b54\u30fb\u89e3\u8aac<\/h2>\n<p>\\( (1) \\)\u3000\\( x^2+12x+36 \\)<\/p>\n<p>\\( (2) \\)\u3000\\( x^2-18x+81 \\)<\/p>\n<p>\\( (3) \\)\u3000\\( 9x^2-16 \\)<br>\n\\( a=3x,\\ b=4 \\) \u306e \\( a^2-b^2 \\)\u3002<\/p>\n<p>\\( (4) \\)\u3000\\( x^2-7x-44 \\)<br>\n\u548c \\( -7 \\)\u3001\u7a4d \\( -44 \\)\u3002<\/p>\n<p>\\( (5) \\)\u3000\\( 6x^2+7x-20 \\)<br>\n\\( 2x\\cdot3x+2x\\cdot(-4)+5\\cdot3x+5\\cdot(-4)=6x^2-8x+15x-20 \\)<\/p>\n<p>\\( (6) \\)\u3000\\( 4a^2+b^2+1-4ab+4a-2b \\)<br>\n\\( p=2a,\\ q=-b,\\ r=1 \\) \u3068\u3057\u3066\u5c55\u958b\u3002<\/p>\n<p>\\( (7) \\)\u3000\\( x^3-12x^2+48x-64 \\)<\/p>\n<p>\\( (8) \\)\u3000\\( 27x^3+27x^2+9x+1 \\)<br>\n\\( a=3x,\\ b=1 \\) \u306e \\( (a+b)^3 \\)\u3002<\/p>\n<p>\\( (9) \\)\u3000\\( x^4+x^2+1 \\)<br>\n\\( (x^2+1+x)(x^2+1-x) \\) \u3068\u898b\u3066 \\( a=x^2+1,\\ b=x \\) \u306e \\( a^2-b^2 \\) \u3092\u9069\u7528\uff1a<br>\n\\( (x^2+1)^2-x^2=x^4+2x^2+1-x^2=x^4+x^2+1 \\)<\/p>\n\n\n\n<div class=\"wp-block-jin-gb-block-box simple-box6\">\n<p class=\"wp-block-paragraph\">\u3042\u3042<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-jin-gb-block-box simple-box1\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30bb\u30c3\u30c8A \u2013 \u554f\u984c \u6b21\u306e\u5f0f\u3092\u5c55\u958b\u305b\u3088\uff0e \\( (1) \\)\u3000\\( (x+3)^2 \\) \\( (2) \\)\u3000\\( (x-5)^2 \\) \\( (3) \\)\u3000\\( (x+7)(x-7) \\) \\( (4) \\)\u3000\\( (x<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jin_ogp_image_url":"","_jin_last_featured_id":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-220","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.masmath.online\/index.php?rest_route=\/wp\/v2\/posts\/220","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.masmath.online\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.masmath.online\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.masmath.online\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.masmath.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=220"}],"version-history":[{"count":6,"href":"https:\/\/www.masmath.online\/index.php?rest_route=\/wp\/v2\/posts\/220\/revisions"}],"predecessor-version":[{"id":231,"href":"https:\/\/www.masmath.online\/index.php?rest_route=\/wp\/v2\/posts\/220\/revisions\/231"}],"wp:attachment":[{"href":"https:\/\/www.masmath.online\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=220"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.masmath.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=220"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.masmath.online\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}