Question

小电脑．

11 42 × 21 22 =	13 48 ÷ 39 64 =	16× 19 40 =	3 7 ÷6=
4 5 ÷ 5 4 =	7 9 ÷ 14 17 =	5 51 ÷ 15 17 =	5 14 ÷ 5 14 =
3 7 ÷ 7 8 =	11 78 ÷ 121 91 =	9 26 ÷ 11 13 =	9 58 ÷ 18 29 =
25× 2 27 × 3 5 =	3 4 × 8 15 × 10 13 =

Answer 1

考点：分数的四则混合运算,分数乘法,分数除法

专题：运算顺序及法则

分析：根据分数的四则运算的计算法则计算即可，要仔细观察算式的特点，灵活运用一些简便计算．

解答： 解：

11 42 × 21 22 = 1 4	13 48 ÷ 39 64 = 4 9	16× 19 40 = 38 5	3 7 ÷6= 1 14
4 5 ÷ 5 4 = 16 25	7 9 ÷ 14 17 = 17 18	5 51 ÷ 15 17 = 1 9	5 14 ÷ 5 14 =1
3 7 ÷ 7 8 = 24 49	11 78 ÷ 121 91 = 7 66	9 26 ÷ 11 13 = 9 22	9 58 ÷ 18 29 = 1 4
25× 2 27 × 3 5 = 10 9	3 4 × 8 15 × 10 13 = 4 13

点评：此题关键是明确分数的四则运算的计算法则．