计算:1)(a^2-1)/(-a)·(2ab^2)/(a^2-2a+1) 2)(x^2-3x)/(x+2)÷(x-3)/(x^2-4)

来源:学生作业帮助网 编辑:作业帮 时间:2024/08/12 17:56:17
计算:1)(a^2-1)/(-a)·(2ab^2)/(a^2-2a+1) 2)(x^2-3x)/(x+2)÷(x-3)/(x^2-4)
x){nue~OFbnFIqF@H(QPS5WhiޮQk EM4mn~ m\JQ` F"P%PTgQE!smL @ L@րJ`l +l 적d<[Ɏg3?[HJb

计算:1)(a^2-1)/(-a)·(2ab^2)/(a^2-2a+1) 2)(x^2-3x)/(x+2)÷(x-3)/(x^2-4)
计算:1)(a^2-1)/(-a)·(2ab^2)/(a^2-2a+1) 2)(x^2-3x)/(x+2)÷(x-3)/(x^2-4)

计算:1)(a^2-1)/(-a)·(2ab^2)/(a^2-2a+1) 2)(x^2-3x)/(x+2)÷(x-3)/(x^2-4)
1)(a^2-1)/(-a)·(2ab^2)/(a^2-2a+1)
=(a+1)(a-1)·(-2b^2)/(a-1)^2
=-2b^2(a+1)/(a-1)

2)(x^2-3x)/(x+2)÷(x-3)/(x^2-4)
=x(x-3)/(x+2)*(x+2)(x-2)/(x-3)
=x(x-2)
=x^2-2x

楼上是正解