题目内容
计算下列各题,能简算的要简算
|
3-
| ||||||||||||||||
|
|
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则
分析:(1)运用乘法分配律解答,
(2)运用减法性质解答,
(3)按照先算除法,再从左到右顺序计算即可解答,
(4)按照先算括号里面的加法,再从左到右顺序计算即可解答.
(2)运用减法性质解答,
(3)按照先算除法,再从左到右顺序计算即可解答,
(4)按照先算括号里面的加法,再从左到右顺序计算即可解答.
解答:
解:(1)
×
+
÷
=
×(
+
)
=
×1
=1.6;
(2)3-
÷
-
=3-
-
=3-(
+
)
=3-1
=2;
(3)
-
×
+
=
-
+
=
+
=1
;
(4)
÷(
+
)×
=
÷
×
=
×
=1.2.
| 2 |
| 3 |
| 8 |
| 5 |
| 1 |
| 3 |
| 5 |
| 8 |
=
| 8 |
| 5 |
| 2 |
| 3 |
| 1 |
| 3 |
=
| 8 |
| 5 |
=1.6;
(2)3-
| 9 |
| 15 |
| 9 |
| 5 |
| 2 |
| 3 |
=3-
| 1 |
| 3 |
| 2 |
| 3 |
=3-(
| 1 |
| 3 |
| 2 |
| 3 |
=3-1
=2;
(3)
| 2 |
| 3 |
| 5 |
| 6 |
| 3 |
| 10 |
| 3 |
| 2 |
=
| 2 |
| 3 |
| 1 |
| 4 |
| 3 |
| 2 |
=
| 5 |
| 12 |
| 3 |
| 2 |
=1
| 11 |
| 12 |
(4)
| 7 |
| 4 |
| 2 |
| 3 |
| 1 |
| 2 |
| 4 |
| 5 |
=
| 7 |
| 4 |
| 7 |
| 6 |
| 4 |
| 5 |
=
| 6 |
| 4 |
| 4 |
| 5 |
=1.2.
点评:(1)依据四则运算计算方法正确进行计算,(2)运用简便方法正确解决问题,是本题考查知识点.
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