题目内容
能简算的要简算
2005-
|
|
|
分析:(1)先算乘法,再算除法,最后算减法;
(2)先算小括号里面的减法,再算中括号里面的除法.最后算括号外面的除法;
(3)根据乘法分配律进行简算.
(2)先算小括号里面的减法,再算中括号里面的除法.最后算括号外面的除法;
(3)根据乘法分配律进行简算.
解答:解:
(1)2005-
×
÷
,
=2005-
÷
,
=2005-8,
=1997;
(2)
÷[(
-
)÷
],
=
÷[
÷
],
=
÷
,
=4;
(3)
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
.
(1)2005-
| 7 |
| 9 |
| 3 |
| 7 |
| 1 |
| 24 |
=2005-
| 1 |
| 3 |
| 1 |
| 24 |
=2005-8,
=1997;
(2)
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 2 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 1 |
| 8 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 1 |
| 5 |
=4;
(3)
| 8 |
| 15 |
| 1 |
| 7 |
| 13 |
| 15 |
=
| 8 |
| 15 |
| 1 |
| 7 |
| 1 |
| 7 |
| 13 |
| 15 |
=(
| 8 |
| 15 |
| 13 |
| 15 |
| 1 |
| 7 |
=
| 7 |
| 5 |
| 1 |
| 7 |
=
| 1 |
| 5 |
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
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