Question

直接寫出得數(shù)

2 9 ×4=	5× 3 10 =	4 5 × 3 8 =	1 1 3 ×6=	7 12 + 5 6 =
9 14 × 14 15 × 5 9 =	1÷ 2 3 =	28 7 9 × 1 7 =	4 9 ×0=	17-7 4 8 =
8 9 ÷4=	0÷ 8 9 × 7 18 =	3 5 ÷3=	14÷ 7 15 =	2 5 ÷0.4=
5 7 ÷ 1 7 =	3 8 ÷ 9 16 =	4 5 × 1 2 =	2 3 ÷ 1 9 =	11 16 ÷ 11 16 =

Answer 1

考點：分?jǐn)?shù)的加法和減法,分?jǐn)?shù)乘法,分?jǐn)?shù)除法

專題：運算順序及法則

分析：異分母分?jǐn)?shù)相加減，先通分化成同分母的分?jǐn)?shù)，再計算；
分?jǐn)?shù)乘法：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；
分?jǐn)?shù)除法：除以一個不為零的數(shù)等于乘上這個數(shù)的倒數(shù)；
28

7

9

×

1

7

先把28

7

9

化成一個28+

7

9

，再根據(jù)乘法分配律簡算．

解答： 解：

2 9 ×4= 8 9	5× 3 10 = 3 2	4 5 × 3 8 = 3 10	1 1 3 ×6=8	7 12 + 5 6 = 17 12
9 14 × 14 15 × 5 9 = 1 3	1÷ 2 3 = 3 2	28 7 9 × 1 7 =4 1 9	4 9 ×0=0	17-7 4 8 =9 1 2
8 9 ÷4= 2 9	0÷ 8 9 × 7 18 =0	3 5 ÷3= 1 5	14÷ 7 15 =30	2 5 ÷0.4=1
5 7 ÷ 1 7 =5	3 8 ÷ 9 16 = 2 3	4 5 × 1 2 = 2 5	2 3 ÷ 1 9 =6	11 16 ÷ 11 16 =1

點評：本題考查了簡單的運算，要注意根據(jù)運算法則和運算定律快速準(zhǔn)確的得出答案．