计算:28x四次幂y²÷7x³y;(12a³-6a²+3a)÷3a
计算:a六次方÷(-2a²)÷(-3a³)100x四次方y六次方÷(-2xy`15x³y)
利用乘法公式计算(x+y)(x²+y²)(x-y)(x的四次方+y四次方)(a-2b+3)(a+2b
因式分解 1.-8x四次方-16x³y 2.(x-y)²+2(y-x) 3.81a四次方-b四次方
因式分解(a²-ab)+c(a-b) (x-y)四次方+x(x-y)³+y(y-x)³
a²(x-y)²-2a(x-y)三次方+(x-y)四次方 因式分解
计算:(1)(-2x)³·(7x²y) (2)(3a²b-6ab²)÷(a-2b
下列计算:①(a²-b²)/(a-b)=a-b;②2y/3x÷(-4y²/9x³
分解因式:3a+12a²+12a³ 16-8(x-y)+(x-y)² a的4次幂b-6a&
1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y)
(x-y)³-x+y (a+b)²-(a-b)² (x-3)³-4x+12
计算:3a(a²-2a+1)-2a²(a-3) (2x-3y)(x+y)
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)