Question

口算： 5 8 ×4=	12× 3 4 =	5 6 × 3 5 =	11 12 × 4 11 =
3 4 × 2 3 =	1 3 + 1 6 =	6 7 × 7 8 =	5 9 × 3 5 =
1- 2 7 =	17× 2 51 =	13 36 × 15 26 =	45× 5 9 =

Answer 1

考点：分数乘法

专题：运算顺序及法则

分析：本题根据分数乘法、加法与减法的运算法则计算即可．

解答： 解：

5 8 ×4= 5 2	12× 3 4 =9	5 6 × 3 5 = 1 2	11 12 × 4 11 = 1 3
3 4 × 2 3 = 1 2	1 3 + 1 6 = 1 2	6 7 × 7 8 = 3 4	5 9 × 3 5 = 1 3
1- 2 7 = 5 7	17× 2 51 = 2 3	13 36 × 15 26 = 5 24	45× 5 9 =25

点评：完成分数乘法算式时要注意约分，完成分数加减法算式时，要注意通分、约分．