(2x-y):(x-y+1)=3:2求x,y正整數。求達人解答,非常感謝?

2017-04-23 10:44 pm

回答 (3)

2017-04-24 4:04 pm
(2x-y):(x-y+1)=3:2
(2x-y)/(x-y+1)=3/2
4x-2y=3x-3y+3
x+y=3
x>0 ,y>0
x=1, y=2
or
x=2, y=1
2017-04-24 7:27 am
Sol
(2x-y):(x-y+1)=3:2
2(2x-y)=3(x-y+1)
4x-2y=3x-3y+3
x+y=3
(1)
x=1,y=2
2x-y=0 (不合)
(2)
x=2,y=1
(2x-y):(x-y+1)
=(4-1):(2-1+2)
=3:2
綜合(1),(2)
x=2,y=1
2017-04-23 11:29 pm
(2x-y):(x-y+1)=3:2
3(x-y+1)=2(2x-y)
3x-3y+3=4x-2y
x+y=3
(x,y)=(1,2) or (2,1)


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