解方程组2x+3y=15.55x+6y=35-查字典问答网
邱康睦
2x+3y=15.5①
5x+6y=35②
①*2-②
(2x+3y=15.5)*2
4X+6Y=31
-X=-4
X=4
带入①式
Y=2.5
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