（a/a-b - b/a+b)÷2b/a²-b² 其中a=-2,b=1
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化简：{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)]
-2a(a+b)+b(a+b)
化简（2a-b/a+b-b/a-b）÷a-2a/a-b
(2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/b]
(2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/a]
(a+b).(a-b)
a/b-b/a
a+b>a-b,
(a+2b)(a-2b)+(a-b)(a+b)-2(a-3b)(a-b)
5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b)
a-b>a,a+b
-a-b+2b^2/a+b
化简：|a+b|+|b-a|+|2b|
|a+b|-|b-a|+|2b|化简哦!
a-b+2b²/a+b
通分a-b,2b^/a+b
(a-b/a+b)^3÷(a-b)^2/a+b乘(-a+b/a-b)^2
[(a²+b²)/(a²-b²)-(a-b)/(a+b)]÷2ab/[(a-b)(a+b)³]