Question

把下列分数化成小数．

1

2

=

1

4

=

3

4

=

1

5

=

2

5

=

3

5

=

4

5

=

1

8

=

3

8

=

5

8

=

7

8

=

Answer 1

考点：小数与分数的互化

专题：运算顺序及法则

分析：把分数化小数，用分数的分子除以分母即得小数商，除不尽时通常保留三位小数．

解答： 解：

1

2

=1÷2=0.5

1

4

=1÷4=0.25

3

4

=3÷4=0.75

1

5

=1÷5=0.2

2

5

=2÷5=0.4

3

5

=3÷5=0.6

4

5

=4÷5=0.8

1

8

=1÷8=0.125

3

8

=3÷8=0.375

5

8

=5÷8=0.625

7

8

=7÷8=0.875．

点评：此题考查分数化小数方法的灵活运用，熟记化法是解题关键．