Question

分数简便算法 求助 ！！！！

Answer 1

× ÷
(3+7/9-2/3)÷(1/6+1/9+1/12)-3÷(1/6+1/9+1/12)
=(3+7/9-2/3-3)÷(1/6+1/9+1/12)
=(7/9-2/3)÷(1/6+1/9+1/12)
=1/9*(7-6)÷(1/6+1/9+1/12)
=1/9÷(1/6+1/9+1/12)
=1/9÷[1/3×(1/2+1/3+1/4)]
=1/3÷(1/2+1/3+1/4)
=1/3÷[1/12×(6+4+3)]
=1/3×12÷(6+4+3)
=4÷13
=4/13

(141+1/13)÷(47+1/39)
=1/3×(141+1/13)÷(47+1/39)×3
=(47+1/39)÷(47+1/39)×3
=1×3
=3

[8.6-(3+4/5)×(3+5/8-3.625)]÷10
=[8.6-(3+4/5)×(3+0.625-3.625)]÷10
=[8.6-(3+4/5)×(3.625-3.625)]÷10
=[8.6-(3+4/5)×0]÷10
=8.6÷10
=0.86