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数学
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用加减消元法解方程组{4x-5y=5,2x+3y=-25
人气:311 ℃ 时间:2020-03-27 11:52:45
解答
4x-5y=5①,2x+3y=-25②
② 2=4x+6y=-50③
③-①=11y=-55 y=-5
代入① 解得x=-5
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