异分母是无法比较大小的,首先通分,找最小公倍数.5.6.3.的最小公倍数是30.设要求的数为X
1/6 = 5/30
X/5 = 6X/30
2/3 = 20/30即 5/30 < 6x/30 < 20/30
5