x³+y³+3xy
=(x+y)³-3x²y-3xy²+3xy
=1-3xy(x+y-1)
=1-0
1
明教为您解答,
请点击[满意答案];如若您有不满意之处,请指出,我一定改正!
希望还您一个正确答复!
祝您学业进步!