9(a+2b)²-4(a-b)² (x²+9y²)-36X²Y
计算:(a-b)(x-y)-(b-a)(x+y) 4+12(x-y)+9(x-y)²
因式分解(a-b)²(x-y)-(b-a)(y-x)²=(a-b)(x-y)×( )
计算:1、(2a-3b)(2a+3b)(-4a²-9b²) 2、(x-2y+3)(x+2y-3)
已知|x-y-3|+(a+b+4)²=0,求2a+2b-(a+b)分之(x-y)²-3(y-x)的值
(x-y)³-x+y (a+b)²-(a-b)² (x-3)³-4x+12
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
已知集合A={(x,y)|(y-2)/(x-1)=a+2,x,y∈R},B={(x,y)|(a²-4)x+(a
分解因式:(2a-b)²+2a-b 2(x-1)²-x+1 9(x+y)²-4(x-y)&
下列计算:①(a²-b²)/(a-b)=a-b;②2y/3x÷(-4y²/9x³
因式分解:(1)(a+b)²+a+b+1/4 (2)6(x-y)²+3(y-x)³
已知A=2x+y,B=2x-y,计算A²-B².
已知A=2x+y,B=2x-y计算A²-B²