Question

計(jì)算

6× 5 9 =	2 5 ×2=	3 11 ×5=	7× 2 14 =
10× 8 15 =	3 5 × 5 6 =	4 7 ×21=	2 3 4 ×8=
4×1 1 2 =	3 8 ×1 1 7 =	420× 3 14 =	2 1 7 ×2 1 3 =

Answer 1

考點(diǎn)：分?jǐn)?shù)乘法

專題：運(yùn)算順序及法則

分析：分?jǐn)?shù)與整數(shù)相乘：分子和整數(shù)相乘的積做分子，分母與分母相乘的積做分母，能約分的先約分．

解答：

解： 6× 5 9 = 10 3	2 5 ×2= 4 5	3 11 ×5= 15 11	7× 2 14 =1
10× 8 15 = 16 3	3 5 × 5 6 = 1 2	4 7 ×21=12	2 3 4 ×8=22
4×1 1 2 =6	3 8 ×1 1 7 = 3 7	420× 3 14 =90	2 1 7 ×2 1 3 =5

點(diǎn)評：本題考查了簡單的分?jǐn)?shù)乘法的計(jì)算，計(jì)算時要細(xì)心，注意把結(jié)果化成最簡分?jǐn)?shù)．