化简(3a-2a+1)²-(a-2b)(a+3b)
若2a²+3a+b=4,求{(a+b)(a-b)+(a-b)²+4a²(a+1)}/a的值
5a²-3a²+3(a²-b²)-2(5a²+2b²)怎么合
2(a²b+3ab²)-3(a²b-1)-2a²b-2
化简(3a-2a+1)²-(a-2b)(a+3b)
计算下列各题(a+b/a-b)²*2a-2b/a+3b - a²/a²-b²÷a
已知A=4a²-3a,B=2a²+a-1,求2A-3B.
化简(a²-2ab+2b²)-(2a²-2ab-3ab²)
2(a²+b²)(a+b)²-(a²-b²)²
a-b+2b²/a+b
已知a.b为实数,且a²-2a+b²=-1,求a+b+3的平方根
先化简再求值(a-b/a+b)+(a+b/a-b)-(2a²-2b²/a²+b²
化简,a²-4a²-3a+6b