(x+y)/4+(x-y)/5=3 (x+y)/4-(x-y)/5=-1,x= ,y=
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(x+y)/4+(x-y)/5=3......(1)
(x+y)/4-(x-y)/5=-1.....(2)
(1)式+(2)式得2(x+y)/4=3+(-1)
x+y=4.......(3)
(1)式-(2)式得2(x-y)/5=3-(-1)
x-y=10.......(4)
(3)式+(4)式得2x=4+10
解得x=7,
所以y=4-x=4-7=-3
望采纳!谢谢!
(x+y)/4-(x-y)/5=-1.....(2)
(1)式+(2)式得2(x+y)/4=3+(-1)
x+y=4.......(3)
(1)式-(2)式得2(x-y)/5=3-(-1)
x-y=10.......(4)
(3)式+(4)式得2x=4+10
解得x=7,
所以y=4-x=4-7=-3
望采纳!谢谢!
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