题目内容
2200÷(1280-72×15) | 5.6×(4.8-4.8÷1.5) | ||||||||||||||||
|
|
分析:(1)(2)(4)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答,
(3)运用乘法分配律解答.
(3)运用乘法分配律解答.
解答:解:(1)2200÷(1280-72×15),
=2200÷(1280-1080),
=2200÷200,
=11;
(2)5.6×(4.8-4.8÷1.5),
=5.6×(4.8-3.2),
=5.6×1.6,
=8.96;
(3)
+
×
+
÷4,
=
×(1+
+
),
=
×10,
=2.5;
(4)
÷[
×(
-
)],
=
÷[
×
],
=
÷
,
=5
.
=2200÷(1280-1080),
=2200÷200,
=11;
(2)5.6×(4.8-4.8÷1.5),
=5.6×(4.8-3.2),
=5.6×1.6,
=8.96;
(3)
1 |
4 |
37 |
7 |
1 |
4 |
26 |
7 |
=
1 |
4 |
37 |
7 |
26 |
7 |
=
1 |
4 |
=2.5;
(4)
4 |
7 |
1 |
3 |
3 |
5 |
3 |
10 |
=
4 |
7 |
1 |
3 |
3 |
10 |
=
4 |
7 |
1 |
10 |
=5
5 |
7 |
点评:本题主要考查学生运用四则运算计算方法,以及正确运用乘法分配律解决问题的能力.
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