计算:8ab÷12a²b;(2x/3y)²·(3y/4x)³
计算:(1)(-2x)³·(7x²y) (2)(3a²b-6ab²)÷(a-2b
因式分解:(1) 12a²b(x-y)³-4ab(y-x)² (2) (a²-4
(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
1.3x-2(2+x) 2.2x-(x+3y)-(-x-y)+(x-y) 3.5a²b-[ 2ab²
计算:(2a-5b)(2a^2-3ab+b^2) (3x+2y)(2x+3y)-(x-3y)(3x+4y)
计算:(-3x²y³)=_____ 计算:(9a²b-6ab²)÷(3ab)=_
计算6x³y^6÷(1/2)y³÷(-3x²y)-(12x^4y^6-8x²y^
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
计算:(a-b)(x-y)-(b-a)(x+y) 4+12(x-y)+9(x-y)²
下列计算:①(a²-b²)/(a-b)=a-b;②2y/3x÷(-4y²/9x³
计算:1、(2a-3b)(2a+3b)(-4a²-9b²) 2、(x-2y+3)(x+2y-3)