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数学
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4X+3Y=9X-2Y=15,求X.Y的值
用二元一次方程组来回答
人气:212 ℃ 时间:2020-04-01 02:41:46
解答
因为4x+3y=15
9x-2y=15
第一式两边同乘以2得8x+6y=30
第二式两边同乘以3得27x-6y=45
说得得方程相加得35x=75
所以x=15/7
带入原方程y=15/7
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