题目内容
计算下面各题.
| 49200÷24-1567 | 2-
|
| ||||||||||||||||||||||||
(
|
|
|
分析:(1)先算除法,再算减法;
(2)先算乘法,再算减法,最后算除法;
(3)先算乘法和除法,再算减法;
(4)先算减法和加法,再算除法;
(5)先算小括号里面的减法,再算乘法,最后算括号外面的减法;
(6)先算减法,再算乘法,最后算除法.
(2)先算乘法,再算减法,最后算除法;
(3)先算乘法和除法,再算减法;
(4)先算减法和加法,再算除法;
(5)先算小括号里面的减法,再算乘法,最后算括号外面的减法;
(6)先算减法,再算乘法,最后算除法.
解答:解:
(1)49200÷24-1567,
=2050-1567,
=483;
(2)(2-
×
)÷
,
=(2-
)÷
,
=1
÷
,
=
;
(3)
×
-
÷
,
=
-
,
=
;
(4)(
-
)÷(
+
),
=
÷
,
=
;
(5)
-
×(
-
),
=
-
×
,
=
-
,
=
;
(6)
÷[
×(
-
)],
=
÷[
×
],
=
÷
,
=2.
(1)49200÷24-1567,
=2050-1567,
=483;
(2)(2-
| 9 |
| 10 |
| 4 |
| 15 |
| 11 |
| 10 |
=(2-
| 6 |
| 25 |
| 11 |
| 10 |
=1
| 19 |
| 25 |
| 11 |
| 10 |
=
| 8 |
| 5 |
(3)
| 5 |
| 6 |
| 8 |
| 15 |
| 3 |
| 20 |
| 9 |
| 10 |
=
| 4 |
| 9 |
| 1 |
| 6 |
=
| 5 |
| 18 |
(4)(
| 13 |
| 12 |
| 5 |
| 6 |
| 3 |
| 8 |
| 1 |
| 6 |
=
| 1 |
| 4 |
| 13 |
| 24 |
=
| 6 |
| 13 |
(5)
| 5 |
| 6 |
| 8 |
| 15 |
| 2 |
| 3 |
| 1 |
| 4 |
=
| 5 |
| 6 |
| 8 |
| 15 |
| 5 |
| 12 |
=
| 5 |
| 6 |
| 2 |
| 9 |
=
| 11 |
| 18 |
(6)
| 9 |
| 10 |
| 1 |
| 2 |
| 6 |
| 5 |
| 3 |
| 10 |
=
| 9 |
| 10 |
| 1 |
| 2 |
| 9 |
| 10 |
=
| 9 |
| 10 |
| 9 |
| 20 |
=2.
点评:考查了四则混合运算.注意运算顺序和运算法则,然后再进一步计算.
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