已知x-y+1的绝对值与x²+8x+16互为相反数,则x²+2xy+y²=_____
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已知x-y+1的绝对值与x²+8x+16互为相反数,则x²+2xy+y²=_____
已知x-y+1的绝对值与x²+8x+16互为相反数,则x²+2xy+y²=_____已知x-y+1的绝对值与x²+8x+16互为相反数,则x²+2xy+y²=_____
x-y+1的绝对值大于等于0,
x²+8x+16=(x+4)² 也是大于等于0
两个大于等于0的数互为相反数,那这两个数都是0
x-y+1=0
x²+8x+16=(x+4)² =0
解得x=-4,那y=-3
x²+2xy+y²=(x+y)²=(-3-4)²=49x²+8x+16=(x+4)²
所以x-y+1的绝对值与(x+4)²互为相反数
所以x-y+1=0,x+4=0
x=-4,y=-3
x²+2xy+y²=(x+y)²=49