题目内容
|
(
|
18×(
| ||||||||||||||||||||
|
[15×(50%+
|
|
分析:(1)先算乘法,再算除法,最后算加法;
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算;
(4)先算减法,再算除法,最后算乘法;
(5)先算加法,再算乘法,最后算除法;
(6)先算加法,再算乘法,最后算除法.
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算;
(4)先算减法,再算除法,最后算乘法;
(5)先算加法,再算乘法,最后算除法;
(6)先算加法,再算乘法,最后算除法.
解答:解:
(1)
+
×15÷
,
=
+
÷
,
=
+
,
=
;
(2)(
+
)×24×
,
=
×24×
+
×24×
,
=
+
,
=
;
(3)18×(
+6×
),
=18×
+18×6×
,
=9+84,
=93;
(4)
÷(
-
)×
,
=
÷
×
,
=
×
,
=
;
(5)[15×(50%+
)]÷
,
=[15×
]÷
,
=
÷
,
=20;
(6)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
.
(1)
| 3 |
| 4 |
| 3 |
| 20 |
| 3 |
| 5 |
=
| 3 |
| 4 |
| 9 |
| 4 |
| 3 |
| 5 |
=
| 3 |
| 4 |
| 15 |
| 4 |
=
| 9 |
| 2 |
(2)(
| 1 |
| 6 |
| 1 |
| 8 |
| 1 |
| 9 |
=
| 1 |
| 6 |
| 1 |
| 9 |
| 1 |
| 8 |
| 1 |
| 9 |
=
| 4 |
| 9 |
| 1 |
| 3 |
=
| 7 |
| 9 |
(3)18×(
| 1 |
| 2 |
| 7 |
| 9 |
=18×
| 1 |
| 2 |
| 7 |
| 9 |
=9+84,
=93;
(4)
| 9 |
| 14 |
| 5 |
| 6 |
| 3 |
| 4 |
| 7 |
| 24 |
=
| 9 |
| 14 |
| 1 |
| 12 |
| 7 |
| 24 |
=
| 54 |
| 7 |
| 7 |
| 24 |
=
| 9 |
| 4 |
(5)[15×(50%+
| 1 |
| 3 |
| 5 |
| 8 |
=[15×
| 5 |
| 6 |
| 5 |
| 8 |
=
| 25 |
| 2 |
| 5 |
| 8 |
=20;
(6)
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 5 |
| 4 |
| 5 |
=
| 9 |
| 20 |
| 1 |
| 2 |
| 6 |
| 5 |
=
| 9 |
| 20 |
| 3 |
| 5 |
=
| 3 |
| 4 |
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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