x/3-y/4=3x+2y-75=3答案
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x/3-y/4=3x+2y-75=3答案x/3-y/4=3x+2y-75=3答案x/3-y/4=3x+2y-75=3答案1)4=[x/(3-y)]/4,12=x/(3-y),12(3x-y)=x,36
x/3-y/4=3x+2y-75=3答案
x/3-y/4=3x+2y-75=3答案
x/3-y/4=3x+2y-75=3答案
1)4=[x/(3-y)]/4,12=x/(3-y),12(3x-y)=x,36x-12y=x,35x=12y 2)4=3x+2y-75,79=3x+2y,2y=79-3x,12y=684-18x,由1）得684-18x=
x=18
y=12
1)4=[x/(3-y)]/4,12=x/(3-y),12(3x-y)=x,36x-12y=x,35x=12y 2)4=3x 2y-75,79=3x 2y,2y=79-3x,12y=684-18x,由1）得684-18x=
x=18
y=12
由题设
x/3-y/4=3
3x+2y-75=3
4x-3y=36
3x+2y=78
联立解得x18，y=12
由题设
x/3-y/4=3
3x+2y-75=3
4x-3y=36
3x+2y=78
解
x=18，y=12
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
x/3-y/4=3x+2y-75=3答案
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