> 数学 >
x-4
=-
4-y
,则xy的算术平方根为______.
人气:152 ℃ 时间:2020-03-19 07:34:54
解答
x-4
=-
4-y
x-4
≥0,
4-y
=0,
∴x=4,y=4,
则xy=4×4=16,
xy
=
16
=4.
故答案为:4.
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