(3a-4b/a-b)+(2a/b-a)-(2b/b-a)
计算:((a+b)(a-b)-(a-b)^2+2b(a-b))/4(a-b)
1.(a-b)^2(b-a)^3(a-b)^-4
计算a^2-b^2/a+b-4a(a-b)+b^2/2a-b
a-b+2b²/a+b
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:{[(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
计算·[(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
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
a+b>a-b,
(a-b)(a b)