x2-y2=48,x+y=6,则x=_,y=_.
问题描述:
x2-y2=48,x+y=6,则x=______,y=______.
答
∵x2-y2=(x+y)(x-y)=48,x+y=6,
∴x-y=8,
联立
,
x+y=6 x−y=8
解得
.
x=7 y=−1