Question

初二计算题

{（【根号a 减 根号b 分之二】 减【a的根号a 加b的根号b 分之 2的根号a】乘以【根号a减根号b 分之 a减根号ab加b】）}除以4的根号ab

注：{(和）}代表小括号
【】则为了清楚点

Answer 1

原式是不是这样的：
｛2/(√a-√b)-(2√a)/(a√a+b√b)×(a-√ab+b)/(√a-√b)｝/4√ab
=｛2/(√a-√b)-(2√a)/(a√a+b√b)×(a-√ab+b)(√a+√b)/(√a+√b)(√a-√b)｝/4√ab
=｛2/(√a-√b)-(2√a)/(a√a+b√b)×(a√a+b√b)/(a-b)｝/4√ab
=｛2/(√a-√b)-(2√a)/(a-b)｝/4√ab
=1/2√a(a-b)
希望你采纳。谢谢！

Answer 2

[2/(√a+√b)-2√a/(a√a+b√b)][(a-√ab+b)/(√a-√b)]÷4√ab
={2/(√a+√b)-2√a/[(√a)³+(√b)³]}[(a-√ab+b)/(√a-√b)]÷4√ab
=[2/(√a+√b)-2√a/(√a+√b)(a-√ab+b)][(a-√ab+b)/(√a-√b)]÷4√ab
=[2(a-√ab+b)-2√a]/(√a+√b)(a-√ab+b)*[(a-√ab+b)/(√a-√b)]÷4√ab
=2(a-√ab+b-√a)/[(√a+√b)/(√a-√b)]÷4√ab

你写错了吧，第一个离2后面没了吗？

Answer 3

看不懂啊:-(，你把式子列出来吧

Answer 4

[2/(√a+√b)-2√a/(a√a+b√b)][(a-√ab+b)/(√a-√b)]÷4√ab
={2/(√a+√b)-2√a/[(√a)3+(√b)3]}[(a-√ab+b)/(√a-√b)]÷4√ab
=[2/(√a+√b)-2√a/(√a+√b)(a-√ab+b)][(a-√ab+b)/(√a-√b)]÷4√ab
=[2(a-√ab+b)-2√a]/(√a+√b)(a-√ab+b)*[(a-√ab+b)/(√a-√b)]÷4√ab
=2(a-√ab+b-√a)/[(√a+√b)/(√a-√b)]÷4√ab

=[2/(√a+√b)-2√a/(√a+√b)(a-√ab+b)][(a-√ab+b)/(√a-√b)]÷4√ab
=[2(a-√ab+b)-2√a]/(√a+√b)(a-√ab+b)*[(a-√ab+b)/(√a-√b)]÷4√ab
=2(a-√ab+b-√a)/[(√a+√b)/(√a-√b)]÷4√ab