题目内容
(2012?建湖县)
| 下面各题怎样简便就怎样算. (1)96×
|
(2)
| ||||||||||||||
(3)
|
(4)
| ||||||||||||||
(5)(
|
(6)(3-0.2)÷
|
分析:(1)把96拆成95+1,再根据乘法分配律进行简算;
(2)括号内连续减去
与
,等于减去
与
的和,然后再进一步计算即可;
(3)先计算除法,再计算乘法,然后约分计算即可;
(4)本题乍一看能运用乘法分配律进行简算,仔细一分析,应先计算除法和乘法,最后计算减法;
(5)根据乘法分配律进行简算;
(6)先计算括号内的减法,再计算除法即可.
(2)括号内连续减去
| 9 |
| 17 |
| 8 |
| 17 |
| 9 |
| 17 |
| 8 |
| 17 |
(3)先计算除法,再计算乘法,然后约分计算即可;
(4)本题乍一看能运用乘法分配律进行简算,仔细一分析,应先计算除法和乘法,最后计算减法;
(5)根据乘法分配律进行简算;
(6)先计算括号内的减法,再计算除法即可.
解答:解:(1)96×
,
=(95+1)×
,
=95×
+1×
,
=7+
,
=7
;
(2)
÷(3-
-
),
=
÷[3-(
+
)],
=
÷(3-1),
=
÷2,
=
×
,
=
;
(3)
÷
×
,
=
×
×
=
;
(4)
÷
-
×
,
=
×
-
×
,
=
-
,
=
;
(5)(
-
+
)×24,
=
×24-
×24+
×24,
=16-12+4,
=8;
(6)(3-0.2)÷
,
=2.8÷
,
=2.8×
,
=6.
| 7 |
| 95 |
=(95+1)×
| 7 |
| 95 |
=95×
| 7 |
| 95 |
| 7 |
| 95 |
=7+
| 7 |
| 95 |
=7
| 7 |
| 95 |
(2)
| 3 |
| 4 |
| 9 |
| 17 |
| 8 |
| 17 |
=
| 3 |
| 4 |
| 9 |
| 17 |
| 8 |
| 17 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 2 |
=
| 3 |
| 8 |
(3)
| 3 |
| 16 |
| 9 |
| 10 |
| 4 |
| 5 |
=
| 3 |
| 16 |
| 10 |
| 9 |
| 4 |
| 5 |
=
| 1 |
| 6 |
(4)
| 5 |
| 6 |
| 3 |
| 4 |
| 2 |
| 9 |
| 3 |
| 4 |
=
| 5 |
| 6 |
| 4 |
| 3 |
| 2 |
| 9 |
| 3 |
| 4 |
=
| 10 |
| 9 |
| 1 |
| 6 |
=
| 17 |
| 18 |
(5)(
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
=
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
=16-12+4,
=8;
(6)(3-0.2)÷
| 7 |
| 15 |
=2.8÷
| 7 |
| 15 |
=2.8×
| 15 |
| 7 |
=6.
点评:能简便计算的,要灵活运用运算定律,然后再进一步进行计算,不能简便计算的,要按照运算顺序进行计算.
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