作业帮(10x+y)-(10y+x)=18 x=8-y
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(10x+y)-(10y+x)=18 x=8-y
(10x+y)-(10y+x)=18 x=8-y
(10x+y)-(10y+x)=18 x=8-y
(10x+y)-(10y+x)=18 x=8-y
9x-9y=18
x-y=2
8-y-y=2
y=3
x=5
9x-9y=18
x=8-y
x=5
y=3
(10x+y)-(10y+x)=18 把
x=8-y
代入
得
X=-7/3
Y=31/7
由(10x+y)-(10y+x)=18得9x-9y=18
x=8-y
x=5
y=3
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{6/x+y+10/x-y=30 6/x+y-10/x-y=-1
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(10x+y)-(10y+x)=18 x=8-y