已知x,y均為正整數,且5x-4y=-3x+8y,試回答下列各題:
1求x:y=?
2若(x,y)+[x,y]=210,求x+y之值為何?
回答 (1)
Sol
(1)
5x-4y=-3x+8y
8x=12y
x:y=12:8=3:2
(2)
x/3=y/2=p
x=3p,y=2p
(x,y)=(3p,2p)=p
[x,y]=[3p,2p]=p[3,2]=6p
p+6p=210
p=30
x+y=5p=150
收錄日期: 2021-04-30 21:43:02
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