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数学
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解方程:{5x+3y=36,{2x-7y=-2
人气:292 ℃ 时间:2020-05-11 16:41:41
解答
2x-7y=-2
x=7y-2/2带入第一个方程得
5(7y-2/2)+3y=36
5(7y-2)+6y=72 每项同x2
35y-10+6y=72
41y=82
y=2带入任一方程得
x=6
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