化简(a²-2ab-b²)-(2a²-2b²)+3ab
化简 a²-(2ab-b²)-b²
3ab+3b²/b(a²+2ab+b²) ×a²-b²/a-b ÷b/
已知|a+1|+(a-b-2)²=0化简ab-[3a²b(4ab²+ab)-3a²
计算 (a²-2ab+b²-a+b)÷(a-b) (a+b)²÷(a-b)
化简 (a²+b²/a²-b²-a-b/a+b)÷2ab/(a-b)(a+b)&
化简:1.b/(a-b)+a/(a+b)-2ab/(b²-a²)
3a²b+ab²-2a²b²-3ab²-3a²b+4ab
化简a/a-b - b-a+b + 2ab/a²-b²
化简:① a²-3ab+4b²-(2b²-3ab-3a²)
a²-2ab+b²化简
若|a-b+3|+(2a+b)²=0,化简2ˆ3ab(2ab+1)-a²(-2ab)
3a²(1/3ab²-b)-(2a²b²-3ab)(-3a)=?