x+y/2+x-y/3=6 3(x+y)-2(x-y)=12
2012-03-04 · 知道合伙人教育行家
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(x+y)/2+(x-y)/3=6 ......(1)
3(x+y)-2(x-y)=12 ......(2)
(1)两边同乘以6得:3(x+y)+2(x-y)=36 ......(3)
(3)+(2)得:6(x+y)=48,即x+y=8 ......(4)
(3)-(2)得:4(x-y)=24,即x-y=6 ......(5)
(4)+(5)得:2x=14,∴x=7
(4)-(5)得:2y=2,∴y=2
3(x+y)-2(x-y)=12 ......(2)
(1)两边同乘以6得:3(x+y)+2(x-y)=36 ......(3)
(3)+(2)得:6(x+y)=48,即x+y=8 ......(4)
(3)-(2)得:4(x-y)=24,即x-y=6 ......(5)
(4)+(5)得:2x=14,∴x=7
(4)-(5)得:2y=2,∴y=2
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