(x-3)(2x+1)-3(2x-1)²能简便计算要简便,如果不能,
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(x-3)(2x+1)-3(2x-1)²能简便计算要简便,如果不能,(x-3)(2x+1)-3(2x-1)²能简便计算要简便,如果不能,(x-3)(2x+1)-3(2x-1)&su
(x-3)(2x+1)-3(2x-1)²能简便计算要简便,如果不能,
(x-3)(2x+1)-3(2x-1)²
能简便计算要简便,如果不能,
(x-3)(2x+1)-3(2x-1)²能简便计算要简便,如果不能,
展开时最简便的方法.
(x-3)(2x+1)-3(2x-1)²
=2x^2-5x-3-3(4x^2-4x+1)
=-10x^2+7x-6
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