题目内容
(2012?瑶海区)
|
|
5.6×123-5.6×24+5.6 | ||||||||||||||||||
24×(
|
|
23÷[
|
分析:(1)先算括号里面的加法,再按照从左到右顺序计算,
(2)(3)(4)运用乘法分配律解答,
(5)按照从左到右顺序计算,
(6)先算小括号里面的,再算中括号里面的,最后算括号外面的解答.
(2)(3)(4)运用乘法分配律解答,
(5)按照从左到右顺序计算,
(6)先算小括号里面的,再算中括号里面的,最后算括号外面的解答.
解答:解:(1)
÷(
+
)÷
,
=
÷
÷
,
=
÷
,
=2;
(2)
×
+
÷5,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)5.6×123-5.6×24+5.6,
=5.6×(123-24+1),
=5.6×100,
=560;
(4)24×(
+
+
),
=24×
+24×
+24×
,
=9+20+6,
=35;
(5)
÷3÷
÷
,
=
÷
÷
,
=
÷
,
=3
;
(6)23÷[
×(
-
)],
=23÷[
×
],
=23÷
,
=92.
2 |
3 |
1 |
5 |
1 |
3 |
5 |
8 |
=
2 |
3 |
8 |
15 |
5 |
8 |
=
5 |
4 |
5 |
8 |
=2;
(2)
1 |
5 |
2 |
7 |
5 |
7 |
=
1 |
5 |
2 |
7 |
5 |
7 |
1 |
5 |
=
1 |
5 |
2 |
7 |
5 |
7 |
=
1 |
5 |
=
1 |
5 |
(3)5.6×123-5.6×24+5.6,
=5.6×(123-24+1),
=5.6×100,
=560;
(4)24×(
3 |
8 |
5 |
6 |
1 |
4 |
=24×
3 |
8 |
5 |
6 |
1 |
4 |
=9+20+6,
=35;
(5)
16 |
5 |
4 |
5 |
3 |
8 |
=
16 |
15 |
4 |
5 |
3 |
8 |
=
4 |
3 |
3 |
8 |
=3
5 |
9 |
(6)23÷[
9 |
14 |
5 |
6 |
4 |
9 |
=23÷[
9 |
14 |
7 |
18 |
=23÷
1 |
4 |
=92.
点评:本题主要考查学生依据四则运算计算方法,依据正确选择并运用简便算法解决问题的能力.
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