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数学
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解方程组:
4x+7y=−19
4x−5y=17
人气:249 ℃ 时间:2019-11-11 22:12:18
解答
4x+7y=−19①
4x−5y=17②
由①-②得:12y=-36,
∴y=-3.
把y=-3代入②得:x=
1
2
.
所以方程组的解为
x=
1
2
y=−3
.
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