[(2b/a^2-b^2)+(a/a^2+ab)]÷3/a-b
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[(2b/a^2-b^2)+(a/a^2+ab)]÷3/a-b[(2b/a^2-b^2)+(a/a^2+ab)]÷3/a-b[(2b/a^2-b^2)+(a/a^2+ab)]÷3/a-b[(2b/a^
[(2b/a^2-b^2)+(a/a^2+ab)]÷3/a-b
[(2b/a^2-b^2)+(a/a^2+ab)]÷3/a-b
[(2b/a^2-b^2)+(a/a^2+ab)]÷3/a-b
[(2b/a^2-b^2)+(a/a^2+ab)]÷3/a-b
=[(2b/(a+b)(a-b)+a/a(a+b)]×(a-b)/3
=[(2b/(a+b)(a-b)+1/(a+b)]×(a-b)/3
=[(2b/(a+b)+(a-b)/(a+b)]×1/3
=(2b+a-b)/(a+b)×1/3
=(a+b)/(a+b)×1/3
=1/3
-2a(a+b)+b(a+b)
5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b)
(a+2b)(a-2b)+(a-b)(a+b)-2(a-3b)(a-b)
化简：a-[b-2a-(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]
化简:[2/3a - 2/(a+b) * (a+b/3a - a - b)] / (a-b)/a
(a/a-b-a/a+b)(a+b)(a-b)/2b
-a-b+2b^2/a+b
(b-a)*(b-a)+(b-a)*2*a等于多少?
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
化简(2a-b/a+b-b/a-b)除以a-2b/a+b
计算：((a+b)(a-b)-(a-b)^2+2b(a-b))/4(a-b)
化简(2a-b/a+b-b/a-b)除以a-2b/a +b