Question

計(jì)算下面各題 5÷ 1 5 =	1 9 × 3 5 =	7÷ 2 7 =	7 9 × 10 7 =
2001÷ 2001 2008 =	5 14 × 21 25 =	7 16 ÷ 14 25 =	10 33 × 3 8 =
3 5 × 5 13 × 13 8 =	5 7 × 7 6 ÷ 5 7 × 7 6 =	1 10 ÷ 1 100 ÷ 1 1000 × 1 10 =	8 25 × 3 14 ÷ 3 14 =

Answer 1

考點(diǎn)：分?jǐn)?shù)的四則混合運(yùn)算,分?jǐn)?shù)乘法,分?jǐn)?shù)除法,分?jǐn)?shù)的簡便計(jì)算

專題：運(yùn)算順序及法則,運(yùn)算定律及簡算

分析：

3

5

×

5

13

×

13

8

根據(jù)乘法結(jié)合律簡算；

5

7

×

7

6

÷

5

7

×

7

6

先把除法變成乘法，然后根據(jù)乘法交換律和結(jié)合律簡算；

8

25

×

3

14

÷

3

14

先把除法變成乘法，再根據(jù)乘法結(jié)合律簡算；
其它題目根據(jù)運(yùn)算法則直接求解．

解答： 解：

5÷ 1 5 =25	1 9 × 3 5 = 1 15	7÷ 2 7 = 49 2	7 9 × 10 7 = 10 9
2001÷ 2001 2008 =2008	5 14 × 21 25 = 3 10	7 16 ÷ 14 25 = 25 32	10 33 × 3 8 = 5 44
3 5 × 5 13 × 13 8 = 3 8	5 7 × 7 6 ÷ 5 7 × 7 6 = 49 36	1 10 ÷ 1 100 ÷ 1 1000 × 1 10 =1000	8 25 × 3 14 ÷ 3 14 = 8 25

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