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x*y=-3 x+y=-1/4x+(xy-4x)-3y=?
人气:146 ℃ 时间:2020-04-07 04:47:04
解答
x+(xy-4x)-3y
=x+xy-4x-3y
=-3x-3y+xy
=-3(x+y)+xy
=-3×(-1/4)+(-3)
=-9/4
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