解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51
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解方程组﹛2(x+y)-3(x-y)=16(x+y)+7(x-y)=51解方程组﹛2(x+y)-3(x-y)=16(x+y)+7(x-y)=51解方程组﹛2(x+y)-3(x-y)=16(x+y)+7
解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51
解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51
解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51
因为2(x+y)-3(x-y)=1
所以2x+2y-3x+3y=1
-x+5y=1
x=5y-1
因为6(x+y)+7(x-y)=51
所以6x+6y+7x-7y=51
13x-y=51
将x=5y-1 代入 13x-y=51得:
13(5y-1)-y=51
65y-13-y=51
64y=64
y=1
所以x=5y-1=5*1-1=4
x=4,y=1
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谢谢
2(x+y)-3(x-y)=1
2x+2y-3x+3y=1
5y-x=1
x=5y-1
6(x+y)+7(x-y)=51
6x+6y+7x-7y=51
13x-y=51
13(5y-1)-y=51
65y-13-y=51
64y=64
y=1
x=5-1=4
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