(计算方程组x+y)/2=6-(x-y)/3,6(x+y)-5(x-y)=18

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(计算方程组x+y)/2=6-(x-y)/3,6(x+y)-5(x-y)=18

(计算方程组x+y)/2=6-(x-y)/3,6(x+y)-5(x-y)=18
(计算方程组x+y)/2=6-(x-y)/3,6(x+y)-5(x-y)=18

(计算方程组x+y)/2=6-(x-y)/3,6(x+y)-5(x-y)=18
化简
x+11y=18(1)
5x+y=36 (2)
(1)*5-(2)
y=1
(2)*11-(1)
x=7