已知x²-4x+4与|y-1/2|互为相反数,则式子(x/y-y/x)÷(x+y)的值为
问题描述:
已知x²-4x+4与|y-1/2|互为相反数,则式子(x/y-y/x)÷(x+y)的值为
答
即(x²-4x+4)+|y-1/2|=0
(x-2)²+|y-1/2|=0
所以x-2=y-1/2=0
x=2,y=1/2
原式=(x²-y²)/xy÷(x+y)
=(x+y)(x-y()/xy÷(x+y)
=(x-y)/xy
=(3/2)/(2×1/2)
=3/2