2.化简(1)(2x-y+z-2c+m)(m+y-2x-2c-z)(2)(a+3b)(a^2-3ab+9b^2)-(a-3b)(a^2+3ab+9b^2)(3)(x+y)^2(y+z-x)+(x-y)^2(x+y+z)(x+y-z)卷子明天就交,救命.我只有5分,
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2.化简(1)(2x-y+z-2c+m)(m+y-2x-2c-z)(2)(a+3b)(a^2-3ab+9b^2)-(a-3b)(a^2+3ab+9b^2)(3)(x+y)^2(y+z-x)+(x-y)^2(x+y+z)(x+y-z)卷子明天就交,救命.我只有5分,
2.化简
(1)(2x-y+z-2c+m)(m+y-2x-2c-z)
(2)(a+3b)(a^2-3ab+9b^2)-(a-3b)(a^2+3ab+9b^2)
(3)(x+y)^2(y+z-x)+(x-y)^2(x+y+z)(x+y-z)
卷子明天就交,救命.我只有5分,
2.化简(1)(2x-y+z-2c+m)(m+y-2x-2c-z)(2)(a+3b)(a^2-3ab+9b^2)-(a-3b)(a^2+3ab+9b^2)(3)(x+y)^2(y+z-x)+(x-y)^2(x+y+z)(x+y-z)卷子明天就交,救命.我只有5分,
(1)[(2x+z-y)+(m-2c)]*[(m-2c)-(2x+z-y)]=(m-2c)平方—(2x+z-y)平方
=(m-2c)^2-[(x+z)+(x-y)]^2=(m-2c)^2-(x+z)^2-2(x+z)(x-y)-(x-y)^2
(2)=(a+3b)*[(a-3b)^2+3ab]-(a-3b)*[(a+3b)^2-3ab]
=(a+3b)*(a-3b)^2+3ab(a+3b)-(a-3b)*(a+3b)^2+3ab(a-3b)
=[(a+3b)*(a-3b)]*(a-3b)-[(a+3b)*(a-3b)]*(a+3b)+6a^2b
=(a^2-9b^2)*(-6b)+6a^2b=54b^3