若|2x+y+1|+√2y+3x=0,则xy=
问题描述:
若|2x+y+1|+√2y+3x=0,则xy=
答
|2x+y+1|+√2y+3x=0,则每项等于0时,才成立
2x+y+1=0 (1)
2y+3x=0 (2)
(1)*2-(2)
x+2=0
x=-2
代入(1)解得y=3
则xy=-6
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