已知x加y等于5xy等于二求5x加4y减去3x减2y加xy的值
人气：417 ℃ 时间：2019-10-17 08:16:42
解答
X+Y=5,
XY=2,
5X+4Y-3X-2Y+XY
=2X+2Y+XY
=2(X+Y)+XY
=2×5+2
=12.
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