题目内容
| 递等式计算. 30-1.6÷
|
|
| ||||||||||||
(
|
(0.75-
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(2)按照先算第二级运算,再算第一级运算顺序计算即可解答,
(3)(4)(5)按照先算括号里面的,再算括号外面的顺序计算即可解答.
(3)(4)(5)按照先算括号里面的,再算括号外面的顺序计算即可解答.
解答:
解:(1)30-1.6÷
=30-6
=24;
(2)
+
÷6
=
+
=
;
(3)
×(
+
)
=
×
=
;
(4)(
+
)÷
=
÷
=
;
(5)(0.75-
)×(
+
)
=
×
=
.
| 4 |
| 15 |
=30-6
=24;
(2)
| 1 |
| 3 |
| 2 |
| 3 |
=
| 1 |
| 3 |
| 1 |
| 9 |
=
| 4 |
| 9 |
(3)
| 1 |
| 15 |
| 1 |
| 3 |
| 1 |
| 12 |
=
| 1 |
| 15 |
| 5 |
| 12 |
=
| 1 |
| 36 |
(4)(
| 1 |
| 6 |
| 1 |
| 2 |
| 6 |
| 7 |
=
| 2 |
| 3 |
| 6 |
| 7 |
=
| 7 |
| 9 |
(5)(0.75-
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
=
| 9 |
| 16 |
| 5 |
| 9 |
=
| 5 |
| 16 |
点评:本题考查知识点:依据四则运算计算方法正确进行计算,关键是计算结果要准确.
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