x+5与2y-3互为倒数,且y+2的倒数等于本身 Thanks!

问题描述:

x+5与2y-3互为倒数,且y+2的倒数等于本身 Thanks!
求x-y的值 -1我想到了,可-1+2=1 1的倒数是1
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(x+5)(2y-3)=1
(y+2)^2=1
y+2=±1
y+2=1
y=-1
y+2=-1
y=-3
y=-1
(x+5)[2×(-1)-3]=1
x=-5.2
y=-3
(x+5)[2×(-3)-3]=1
x=-5又1/9