[(2b-a)(3a+2b)-(a+2b)²]÷(-1/2a)
化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b)
[(a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a
(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)]
[(2b-a)(3a+2b)-(a+2b)²]÷(-1/2a)
化简 (a²+b²/a²-b²-a-b/a+b)÷2ab/(a-b)(a+b)&
计算:a/b(a-b)-b/a(a-b);(1/a+1/b)÷a²+2ab+b²/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
已知2a-b+1的绝对值+(3a+3/2b)^=0,求(b^/a+b)÷{[(b/a-b)+1][a-(a^/a+b)]
(a+b/a-b)²×2a-2b/3a+3b÷ab/a²-b²
已知|3a+3/2b|+(2a-b+1)²=0,求b²/a+b÷(a/a+b-1)(a-a²