[(2b-a)(3a+2b)-(a+2b)²]÷(-0.5a)
[(a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a
2b²+(a+b)(a-b)-(a-b)²,其中a=-3
计算:a/b(a-b)-b/a(a-b);(1/a+1/b)÷a²+2ab+b²/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 (a²+b²/a²-b²-a-b/a+b)÷2ab/(a-b)(a+b)&
计算 (a²-2ab+b²-a+b)÷(a-b) (a+b)²÷(a-b)
(a+b/a-b)²×2a-2b/3a+3b÷ab/a²-b²
化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b)
先化简,再求值;[(2a-b/a+b)-(b/a-b)]÷{(a-2b/a+b)+[ab/(a-b)²]},其
(a+b/a-b)²×2a-2b/3a+3b-a²/a²-b²÷a/b
先化简再求值,[(2b-a)(3a+2b)-(a+2b)²]÷(-0.5a)