通分．（1）35和56；（2）527和481；（3）2314和47．

Question

通分．
（1）(3)/(5)和(5)/(6)；      （2）(5)/(27)和(4)/(81)；      （3）((2)/(31))/(4)和(4)/(7)．

Answer 1

（1）(3)/(5)和(5)/(6)
(3)/(5)=(3×6)/(5×6)=(18)/(30)

(5)/(6)=(5×5)/(6×5)=(25)/(30)

（2）(5)/(27)和(4)/(81)
(5)/(27)=(5×3)/(27×3)=(15)/(81)

(4)/(81)=(4)/(81)

（3）((2)/(31))/(4)和(4)/(7)
((2)/(31))/(4)=(1)/(62)=(1×7)/(62×7)=(7)/(432)

(4)/(7)=(4×62)/(7×62)=(248)/(432)