Question

如果绝对值X-2Y和（X+Y-3)²互为相反数,则X的Y次方为多少?

Answer 1

因为|x-2y|和(x+y-3)^2均为非负，故|x-2y|=(x+y-3)^2=0

x-2y=0

x+y-3=0

x=2,y=1

x^y=2^1=2