Question

简便计算急急急急急急急急急急急急急急急急急急急急急急急急急急急

4/5×1/6﹢4/5÷6
2/3＋3/10﹣5/6
﹙3/4﹣3/16﹚×﹙2/9＋1/3﹚
2/13×14
3.6－﹙2/5＋1/4×12/5）
10/9×[3/5－﹙1/3＋1/6﹚

Answer 1

4/5 X 1/6 + 4/5 / 6
= 4/5 X 1/6 + 4/5 X 1/6
= 4/5 X 2/6
= 4/15

2/3 + 3/10 - 5/6
= (40 + 18 - 50)/60
= 8/60
= 2/15

(3/4 - 3/16) X (2/9 + 1/3)
= 3/4 X (1 - 1/4) X (2/3 + 1) X 1/3
= 1/4 X 3/4 X 5/3
= 5/16

2/13 X 14
= 2/13 X 13 + 2/13
= 2+ 2/13

3.6 - (2/5 + 1/4 X 12/5)
= 3.6 - (2/5 + 3/5)
= 3.6 - 1
= 2.6

10/9 X [ 3/5 - (1/3 + 1/6) ]
= 10/9 X [ 0.6 - 1/2 ]
= 10/9 X 0.6 - 10/9 X 1/2
= 6/9 - 5/9
= 1/9