(1)4x²-(1/4)y² (2)8xy-x²-16y² (3)2m(a-b)
(1)4x²-(1/4)y² (2)8xy-x²-16y² (3)2m(a-b)
(1).设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X-
(1)16-(2a+3b)²(2)-36x²+12xy-y²(3)4x(a-b)-8y(b
已知(x-2)²+|y+1| =0,A=5x²+3xy-4y²,B=x²+2xy
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
因式分解2x²y-xy-3y (-a+b)+c²(a-b)
1、(m-n-3)² 2、x³y-4x²y²+3xy³
1、4m-7n-2(m-2n) 2、-(x²-2xy-y²)+(5x²-2xy-3y
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
化简分式;(1)3xy/42x-3xy(2)a-b/a²-b²(3)x²+2xy+y
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,