(2x³-8x)÷(x²+2x)分解因式,然后下面是
问题描述:
(2x³-8x)÷(x²+2x)分解因式,然后下面是
9x²=(x-2)²,丨x+y+1丨+丨xy-3丨=0 那xy³+x³y=?
答
丨x+y+1丨+丨xy-3丨=0
所以 丨x+y+1丨=0 丨xy-3丨=0
所以 x+y=-1 xy=3
xy³+x³y=xy(y²+x²)
=xy[(x+y)²-2xy]
=3*[(-1)²-2*3]
=-15(2x³-8x)÷(x²+2x)分解因式,(2x³-8x)÷(x²+2x)=[2x(x²-4)]÷[x(x+2)] =2(x-2)