化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b)
化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b)
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
化简:{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)]
化简(2a-b/a+b-b/a-b)除以a-2b/a +b
化简(2a-b/a+b-b/a-b)除以a-2b/a+b
化简 (a²+b²/a²-b²-a-b/a+b)÷2ab/(a-b)(a+b)&
a-b\a+b=1\2时,求代数式a+b\3(a-b) - a-b\2(a+b)
请化简以下两道题(a+2b)(a-2b)-1/2b(a-8b)(a+b)²+(a-b)(2a+b)-3a
化简 |a+b|-|3a-2b|
A=B+B+B+B+B+B+B+B+B+B+B+B+B+B+B A-B×3=C C+2×7+2=1
化简 (a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
计算代数式a-b+(a-2b)(a-b)+(a-2b)(a-b)²+(a-2b)(a-b)^3 当a=-3