Question

小学六年级的简便运算

13.9×137/138+137×1又1/138

(11/19×0.317+0.317×18/19-0.317)÷3.17-(0.875-3/4+1/8-0.25)

附:把过程说清楚些,谢谢.

Answer 1

13.9×137/138+137×1又1/138=139*0.1*137/138+137*139/138=139*137*(0.1+1)/138=209473/1380

(11/19×0.317+0.317×18/19-0.317)÷3.17-(0.875-3/4+1/8-0.25)=0.317*(11/19+18/19-1)/3.17-(7/8-6/8+1/8-2/8)=0.1*(11+18-19)/19-(7-6+1-2)/8=1/19-0=1/19

Answer 2

13.9×137/138+137×1又1/138
=139*137*0.1/138+137*139/138
=(138+1)(138-1)/138+(138+1)(138-1)/138
=(138^2-1)/138+(138^2-1)/138
=138-1/138+138-1/138
=276-1/69

(11/19×0.317+0.317×18/19-0.317)÷3.17-(0.875-3/4+1/8-0.25)
=(11/19×3.17×0.1+0.1×3.17×18/19-0.1×3.17)÷3.17-(0.875-0.75+0.125-0.25)
=11/190+18/190-0.1-(1-1)
=29/190-1/10
=29/190-19/190
=10/190=1/19
过程很详细了吧！！！给分吧！！！！！！！