Question

直接寫(xiě)出得數(shù)． 35× 3 5 =	2 21 × 7 18 =	1 5 × 5 4 =	5 9 × 1 10 =
24× 5 6 =	3 10 × 2 3 =	3 7 × 1 6 =	0×8 1 99 ×99=

Answer 1

分析：根據(jù)分?jǐn)?shù)乘法的計(jì)算法則可以直接計(jì)算，注意能約分的要先約分，結(jié)果一定是最簡(jiǎn)分?jǐn)?shù)，最后一題根據(jù)0乘任何數(shù)都得0可直接作答．

解答：解：35×

3

5

=21       

2

21

×

7

18

=

1

27

       

1

5

×

5

4

=

1

4

        

5

9

×

1

10

=

1

18

24×

5

6

=20           

3

10

×

2

3

=

1

5

         

3

7

×

1

6

=

1

14

       0×8

1

99

×99=0

點(diǎn)評(píng)：本題主要考察了分?jǐn)?shù)乘法的計(jì)算法則，分?jǐn)?shù)乘分?jǐn)?shù)，用分子相乘的積做分子，分母相乘的積做分母，能約分的要先約分．