Question

直接写出答案． 1 3 ×3=	1 3 × 1 3 =	3× 1 4 =
8× 2 17 =	3 10 × 5 12 =	4 5 × 1 8 =
7 8 × 4 7 =	5 12 × 1 2 =

Answer 1

分析：分数乘法的计算法则：分子乘分子，分母乘分母，能约分的先约分．

解答：解：

1 3 ×3=1	1 3 × 1 3 = 1 9	3× 1 4 = 3 4
8× 2 17 = 16 17	3 10 × 5 12 = 1 8	4 5 × 1 8 = 1 10
7 8 × 4 7 = 1 2	5 12 × 1 2 = 5 24 ．

点评：本题考查了简单的分数乘法的计算，计算时要细心，注意把结果化成最简分数．