17分之5×23+17分之1×55
=(5/17)x23+(5/17)x11
=(5/17)x(23+11)
=(5/17)x34
=10
93×92分之89
=(92+1)x(89/92)
=89+89/92
=89又89/92
12.5％×5分之6-5分之1×8分之1
=(1/8)x(6/5)-(1/5)(1/8)
=(1/8)x(6/5-1/5)
=1/8
62.5％×0.75×40％
=62.5％×(0.75×40%)
=62.5％×30%
=5/8x3/10
=3/16
6分之1÷（6分之1+6分之1）
=1/6÷（1/6+1/6）
=1/6x6/2
=2