Question

計算

1 2 × 1 3	2 5 × 15 8	5 21 × 3 7	8 27 × 9 16
14 25 × 5 21	7 10 × 5 14	8 21 × 27 16	2 3 × 9 5
9 20 × 10 27	6 7 × 35 21	11 12 × 8 33	3 4 × 8 21 ．

Answer 1

考點：分數(shù)乘法

專題：運算順序及法則

分析：本題根據(jù)分數(shù)乘法的運算法則計算即可．分數(shù)乘整數(shù)，用分數(shù)的分子和整數(shù)相乘的積做分子，分母不變 分數(shù)乘分數(shù)，用分子相乘的積做分子，分母相乘的積做分母，能約分的要約分．

解答： 解：

1 2 × 1 3 = 1 6	2 5 × 15 8 = 3 4	5 21 × 3 7 = 5 49	8 27 × 9 16 = 1 6
14 25 × 5 21 = 2 15	7 10 × 5 14 = 1 4	8 21 × 27 16 = 9 14	2 3 × 9 5 = 6 5
9 20 × 10 27 = 1 6	6 7 × 35 21 = 10 7	11 12 × 8 33 = 2 9	3 4 × 8 21 = 2 7

點評：完成本題要細心分析式中數(shù)據(jù)，注意約分．