如果a+1/20=b+1/21=a+b/17,那么a/b=_.
问题描述:
如果
=a+1 20
=b+1 21
,那么a+b 17
=______. a b
答
设
=a+1 20
=b+1 21
=a+b 17
,则t 1
,
a+1=20t b+1=21t a+b=17t
解得
,
t=
1 12 a=
2 3 b=
3 4
∴
=a b
.8 9