3x+3y=27 (27/y)-(27/x)=1+21/60
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3x+3y=27 (27/y)-(27/x)=1+21/60
解这个方程组
3x+3y=27
(27/y)-(27/x)=1+21/60
解这个方程组
3x+3y=27
(27/y)-(27/x)=1+21/60
![3x+3y=27 (27/y)-(27/x)=1+21/60](/uploads/image/z/15720691-67-1.jpg?t=3x%2B3y%EF%BC%9D27+%EF%BC%8827%2Fy%EF%BC%89-%EF%BC%8827%2Fx%EF%BC%89%EF%BC%9D1%EF%BC%8B21%2F60)
3x+3y=27 ---->x+y=9.(1)
x=9-y
(27/y)-(27/x)=1+21/60---->1/x-1/y=1/20
1/(9-y)-1/y=1/20
20(y-(9-y))=y(9-y)
y^2+31y-180=0
(y+36)(y-5)=0
y1=5,x1=9-y=4
y2=-36,x2=9-y=45
方程组解为:
x1=4,y1=5,或,
x2=45,y2=-36
x=9-y
(27/y)-(27/x)=1+21/60---->1/x-1/y=1/20
1/(9-y)-1/y=1/20
20(y-(9-y))=y(9-y)
y^2+31y-180=0
(y+36)(y-5)=0
y1=5,x1=9-y=4
y2=-36,x2=9-y=45
方程组解为:
x1=4,y1=5,或,
x2=45,y2=-36
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