题目内容
(1)2
-
=
;
(2)4-2
=
.
| 8 |
| 15 |
| 11 |
| 15 |
| 9 |
| 5 |
| 9 |
| 5 |
(2)4-2
| 3 |
| 5 |
| 7 |
| 5 |
| 7 |
| 5 |
分析:(1)先把2
化成假分数
,进而计算
-
=
=
;
(2)先把4转化成分母是5的假分数
,把2
转化成
,进而计算
-
=
.
| 8 |
| 15 |
| 38 |
| 15 |
| 38 |
| 15 |
| 11 |
| 15 |
| 27 |
| 15 |
| 9 |
| 5 |
(2)先把4转化成分母是5的假分数
| 20 |
| 5 |
| 3 |
| 5 |
| 13 |
| 5 |
| 20 |
| 5 |
| 13 |
| 5 |
| 7 |
| 5 |
解答:解:(1)2
-
,
=
-
,
=
,
=
;
(2)4-2
,
=
-
,
=
.
故答案为:
,
.
| 8 |
| 15 |
| 11 |
| 15 |
=
| 38 |
| 15 |
| 11 |
| 15 |
=
| 27 |
| 15 |
=
| 9 |
| 5 |
(2)4-2
| 3 |
| 5 |
=
| 20 |
| 5 |
| 13 |
| 5 |
=
| 7 |
| 5 |
故答案为:
| 9 |
| 5 |
| 7 |
| 5 |
点评:此题考查同分母分数减法计算方法的运用,解决此题关键是把整数或带分数先化成假分数,进而计算得解.
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