用完全平方公式计算（a一b十c）（一a十b一c） (a一2b十c)(a十2b一c)过程，谢谢
(a\u5341b\u4e00C)(\u4e00a\u5341b\u5341C)\u8ba1\u7b97\u7ed3\u679c(a\u5341b\u5341c)(a\u4e00b\u5341c)\u8fd0\u7528\u4e58\u6cd5\u516c\u5f0f\u8ba1\u7b97\u7b54\u6848
(a\u5341b\u5341c)(a\u4e00b\u5341c)
=\u3010(a+c)+b\u3011\u3010(a+c)-b\u3011
=(a+c)^2-b^2
=a^2-b^2+c^2+2ac
\u89e3\uff1a\u539f\u5f0f=[a-(2b-c)]*[a+(2b-c)]
=a^2-(2b-c)^2
=a^2-(4b^2-4bc+c^2)
=a^2-4b^2+4bc-c^2
\u8bf4\u660e\uff1a\uff081\uff09\u672c\u9898\u4e2d\u5229\u7528\u4e86\u5e73\u65b9\u5dee\u516c\u5f0fa^2-b^2=(a-b)(a+b)\u4e0e\u5b8c\u5168\u5e73\u65b9\u516c\u5f0f(a-b)^2=a^2-2ab+b^2
\uff082\uff09\u5728\u5e94\u7528\u5e73\u65b9\u5dee\u516c\u5f0f\u4e0e\u5b8c\u5168\u5e73\u65b9\u516c\u5f0f\u65f6\uff0c\u6ce8\u610f\u6574\u4f53\u601d\u60f3\u7684\u5e94\u7528\uff0c\u5373\u628a\u76f8\u540c\u7684\u9879\u770b\u4f5c\u4e00\u4e2a\u6574\u4f53\uff0c\u5373\u201c\u89c6\u591a\u4e3a\u4e00\u201d\u3002
\u5176\u5b83\u56e0\u5f0f\u5206\u89e3\u7684\u7b56\u7565\u4e0e\u6280\u5de7\u53ef\u53c2\u8003\u300a\u56e0\u5f0f\u5206\u89e3\u6280\u5de7\u300b\u5355\u58ab\u8457
(a一b十c)(一a十b一c)
=(a一b十c)(a一b十c)*(-1)
=-(a一b十c)²
-｛a+c-b}{a+c-b}
绛旓細鍥炵瓟锛-{a+c-b}{a+c-b}
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