(a^2+2b)^2-(2b+1)^2
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
a-b+2b²/a+b
a-b\a+b=1\2时,求代数式a+b\3(a-b) - a-b\2(a+b)
1- a+b分之a+2b
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:((a+b)(a-b)-(a-b)^2+2b(a-b))/4(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)
化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b)
计算a-b+2b