【21a^3(x-y)^2】/【14a^2x(x^2-x^2)】

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/30 12:01:57
【21a^3(x-y)^2】/【14a^2x(x^2-x^2)】【21a^3(x-y)^2】/【14a^2x(x^2-x^2)】【21a^3(x-y)^2】/【14a^2x(x^2-x^2)】【21a

【21a^3(x-y)^2】/【14a^2x(x^2-x^2)】
【21a^3(x-y)^2】/【14a^2x(x^2-x^2)】

【21a^3(x-y)^2】/【14a^2x(x^2-x^2)】
【21a^3(x-y)^2】/【14a^2x(x^2-y^2)】
=3a(x-y)/[2x(x+y)]

分母为0啊

题目有问题

【21a^3(x-y)^2】/【14a^2x(x^2-x^2)】
=[3*7*a^3*(x-y)^2]/[2*7*a^2*x*(x+y)(x-y)]
=[3a(x-y)]/[2x(x+y)]

[21a^3(x-y)^2]/[14a^2x(x^2-y^2)]?
=[21a^3(x-y)^2]/[14a^2x(x+y)(x-y)]
分子分母都有7a^2(x-y)约去
=[3a(x-y)]/[2x(x+y)]