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数学
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y=2x+1 -2x+3y=-9 求算X和Y
y=2x+1
-2x+3y=-9
求算X和Y
人气：425 ℃ 时间：2020-03-26 12:00:09
解答
-2x＋3（2x＋1）=－9
4x＋3=－9
x=－3
y=2×（－3）＋1
=－5
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