1.12×(1/3－1/10)=12×(10/30－3/30)=12×7/30=14/5=2又5分之4
2.(1.2－1又4之1)×4/6＋6/7=(6/5－5/4)×4/6＋6/7
=(24/20－25/20)×4/6＋6/7= -1/20×4/6＋6/7= -1/30＋6/7
=-7/210＋180/210=173/210
3.2.6－3/7－1又5分之1=13/5－3/7－6/5=(13/5－6/5)－3/7
=7/5－3/7=49/35－15/35=34/35
4.1/3×3×1/3×3=1×1/3×3=1/3×3=1
5.(4又8分之7＋13/16)÷13/10=(39/8＋13/16)÷13/10
=(78/16＋13/16)÷13/10=91/16÷13/10=91/16×13/10=35/7=4又8分之3
6.(2/29＋3/23)×29×23 =2/29×29×23＋3/23×29×23 =2×23＋3×29
=46＋87=133