解方程组：3(x+y)+2(x-y)=11,6(x+y)-5(x-y)=13.

来源：学生作业帮助网编辑：作业帮时间：2024/05/12 05:31:14

解方程组：3(x+y)+2(x-y)=11,6(x+y)-5(x-y)=13.
解方程组：3(x+y)+2(x-y)=11,6(x+y)-5(x-y)=13.

解方程组：3(x+y)+2(x-y)=11,6(x+y)-5(x-y)=13.
(1) 3x+3y+2x-2y=11
5x+y=11
(2) 6x+6y-5x+5y=13
x+11y=13
将(2)乘以5 ,得:5x+55y=65 (3)
将(3)减去(1),得:54y=54
y=1
将y=1代入(1),得:5x+1=11
解,得:x=2
则原方程式的解为:x=2,y=1

3x+3y-2x-2y=11，
x+y=11①
6x+6y-5x+5y=13
x+11y=13②
②-①
10y=2，
y=1/5
则， x=54/5

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