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数学
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5x-9y=-2,3x-2y=9这个方程组怎么解?
人气:317 ℃ 时间:2019-10-19 12:01:07
解答
5x-9y=-2.① 3x-2y=9.②
① ×3=15x-27y=-6.③
②×5=15x-10y=45.④
④-③=17y=51,y=3
将y=3代入②,则x=5
∴x=5,y=3
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