化简(5a²+2a)-4(2+2a²).
化简:(b²-a²)/(a²-2ab+b²)
化简(5a²+2a)-4(2+2a²).
化简:5(a²b-3ab²)-2(2a²-7ab²)
计算:7a²b-(-4a²b+5ab²)-2(2a²b-3ab²)
5a²-3a²+3(a²-b²)-2(5a²+2b²)怎么合
(a²+b²)²-4a²b²化简
2(a²+b²)(a+b)²-(a²-b²)²
1.(b²+2a²)(2a²-b²) 2.(4x²-4y²)
-(2a²+5)-(3a²-2)-2(-4a²-1)这道题答案是3a²-1
2(a²-ab)-4(2a²-3ab)-2【a²-(2a²-ab+b²
先化简,再求值:[(a²-1)/(a²-4)]•[(a+2)/(a²-2a+1
a²-{-4ab+(ab-a²)}-2ab化简