(1) x²-(x³y-2x²y²)÷xy (2) (1-1/2)(1+1/2)(1+1/4)(1+1/16)(3) (2x-3y)²-(y+3x)(3x-y) (4) (2a³b²-4a的四次方b³+6a的五次方b的四次方)÷(-2a³b²)

问题描述:

(1) x²-(x³y-2x²y²)÷xy (2) (1-1/2)(1+1/2)(1+1/4)(1+1/16)
(3) (2x-3y)²-(y+3x)(3x-y) (4) (2a³b²-4a的四次方b³+6a的五次方b的四次方)÷(-2a³b²)

(1) x²-(x³y-2x²y²)÷xy =x²-x²+2xy=+2xy(2) (1-1/2)(1+1/2)(1+1/4)(1+1/16)=(1-1/4)(1+1/4)(1+1/16)=(1-1/16)(1+1/16)=1-1/256=255/256(3) (2x-3y)²...