计算 (x+1)(3x-2)-(3x+1)(x-1)
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计算 (x+1)(3x-2)-(3x+1)(x-1)
计算 (x+1)(3x-2)-(3x+1)(x-1)
计算 (x+1)(3x-2)-(3x+1)(x-1)
(x+1)(3x-2)-(3x+1)(x-1)
=(3x+1)(x+1)-3(x+1)-(3x+1)(x-1)
=(3x+1)(x-1)+2(3x+1)-3(x+1)-(3x+1)(x-1)
=6x+2-3x-3
=3x-1
乘法分配律 自己算
-(x+1)(x-1)
原式=3x^2-2x+3x-2-(3x^2-3x+x-1)
=x-2+2x+1
=3x-1
原始=3x^+3x-2x-2-(3x^+x-3x-1)
=(3-3)x^+(3+3+2-1)x+(1-2)
=7x-1
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