Question

小小神算手

6× 2 7	4 9 ×12	80× 3 4	2 11 ×33	5 12 ×6	28× 5 7
24× 5 8	7 13 ×26	3 11 ×3	5 6 ×7	5 21 ×3	4 15 ×10
7 12 ×9	7 11 ×4	3 29 ×17	7 10 ×7	6 7 × 2 3	5 18 × 9 15
12 121 × 11 12	11 36 × 6 11	4 51 × 3 4	3 28 × 14 15	17 18 × 6 34	5 9 × 3 10

Answer 1

考點：分數(shù)乘法

專題：運算順序及法則

分析：分數(shù)乘整數(shù)的計算方法：分子與整數(shù)相乘的積做分子，分母不變，能約分的先約分進行求解；
分數(shù)乘分數(shù)的計算方法：分子相乘的積做分子，分母相乘的積做分母，能約分的先約分．

解答： 解：

6× 2 7 = 12 7	4 9 ×12= 16 3	80× 3 4 =60	2 11 ×33=6	5 12 ×6= 5 2	28× 5 7 =20
24× 5 8 =15	7 13 ×26=14	3 11 ×3= 9 11	5 6 ×7= 35 6	5 21 ×3= 5 7	4 15 ×10= 8 3
7 12 ×9= 21 4	7 11 ×4= 28 11	3 29 ×17= 51 29	7 10 ×7= 49 10	6 7 × 2 3 = 4 7	5 18 × 9 15 = 1 6
12 121 × 11 12 = 1 11	11 36 × 6 11 = 1 6	4 51 × 3 4 = 1 17	3 28 × 14 15 = 1 10	17 18 × 6 34 = 1 6	5 9 × 3 10 = 1 6 ．

點評：本題考查了分數(shù)乘法的計算，計算時要細心，注意把結(jié)果化成最簡分數(shù)．