化简a/(a-b)-b/(a+b)+(2ab)/(a^2-b^2)
(a-b)(a^2+ab+b) 化简
化简 (a²+b²/a²-b²-a-b/a+b)÷2ab/(a-b)(a+b)&
若a/b=2 则a*a-ab+b*b/a*a+b*b等于?
a+b/2ab
2AB/A+B
有理数ab满足a+b<0.化简|a+b|+(-a)+(-b)+2a+2b
化简a/a-b - b-a+b + 2ab/a²-b²
化简a-b分之a+a+b分之b+b平方-a平方分之2ab
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
(a^2+b^2/a^2-b^2-a-b/a+b)/2ab/(a-b)(a+b)