六年级数学题解答~

(1/4-1/8)÷5/12
＝1/4×12/5-1/8×12/5
＝3/5-3/10
＝3/10

2/5×(1/2+1/3)÷4/9
＝（2/5×1/2+2/5×1/3）÷4/9
＝1/5×9/4+2/15×9/4
＝9/20+6/20
＝15/20＝3/4

[17/12-(3/4_1/6)]÷3/4
＝17/12×4/3-（3/4×4/3-1/6×4/3）
＝17/9-（1-2/9）
＝17/9-7/9
＝10/9

9/13÷27/26-4/9
＝9/13×26/27-4/9
＝2/3-4/9
＝2/9

解：
(1/4-1/8)÷5/12 = 1/8 ÷ 5/12 = 3/10
2/5×(1/2+1/3)÷4/9 = 2/5 * 5/6 ÷ 4/9 = 1/3 ÷ 4/9 = 3/4
[17/12-(3/4_1/6)]÷3/4 = (17/12 - 7/12)÷ 3/4 = 8/5
9/13÷27/26-4/9 = 2/3 - 4/9 = 2/9

(1/4-1/8)÷5/12
=(2/8-1/8)÷5/12
=1/8*12/5
=12/40
=3/10

2/5×(1/2+1/3)÷4/9
=2/5*5/6*9/4
=3/4

[17/12-(3/4_1/6)]÷3/4
=(17/12-7/12)*4/3
=10/9

9/13÷27/26-4/9
=9/13*26/27-4/9
=2/3-4/9
=2/9

3/10
3/20
68/49
2/9