题目内容
能简算的要简算. 0.5×
|
23-
| ||||||||||||
|
| ||||||||||||
5÷[(
|
|
分析:(1)按照从左向右的顺序进行计算;
(2)先算乘法,再算除法,最后算减法;
(3)根据乘法分配律进行计算;
(4)先算除法,再按照从左向右的顺序进行计算;
(5)先算加法,再算乘法,最后算除法;
(6)根据乘法分配律进行计算.
(2)先算乘法,再算除法,最后算减法;
(3)根据乘法分配律进行计算;
(4)先算除法,再按照从左向右的顺序进行计算;
(5)先算加法,再算乘法,最后算除法;
(6)根据乘法分配律进行计算.
解答:解:
(1)0.5×
÷
,
=
÷
,
=
;
(2)23-
×
÷
,
=23-
÷
,
=23-18,
=5;
(3)
×7+
×11,
=
×(7+11),
=
×18,
=10;
(4)
+
÷
+
,
=
+
+
,
=1+
,
=1
;
(5)5÷[(
+
)×
],
=5÷[
×
],
=5÷
,
=75;
(6)
×99+
,
=
×(99+1),
=
×100,
=16.
(1)0.5×
8 |
9 |
3 |
4 |
=
4 |
9 |
3 |
4 |
=
16 |
27 |
(2)23-
8 |
9 |
3 |
4 |
1 |
27 |
=23-
2 |
3 |
1 |
27 |
=23-18,
=5;
(3)
5 |
9 |
5 |
9 |
=
5 |
9 |
=
5 |
9 |
=10;
(4)
1 |
7 |
5 |
7 |
5 |
6 |
5 |
12 |
=
1 |
7 |
6 |
7 |
5 |
12 |
=1+
5 |
12 |
=1
5 |
12 |
(5)5÷[(
2 |
3 |
1 |
5 |
1 |
13 |
=5÷[
13 |
15 |
1 |
13 |
=5÷
1 |
15 |
=75;
(6)
4 |
25 |
4 |
25 |
=
4 |
25 |
=
4 |
25 |
=16.
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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