题目内容
怎样简便就怎样算:
24×(
|
|
2.8×(
| ||||||||||||||
23×
|
101×
|
6÷
|
分析:(1)根据乘法分配律进行计算,
(2)先把除法转化成乘法,再计算,
(3)根据乘法分配律进行计算,
(4)根据乘法分配律进行计算,
(5)把101写成(102-1)再根据乘法分配律进行计算,
(6)先算除法,再算减法.
(2)先把除法转化成乘法,再计算,
(3)根据乘法分配律进行计算,
(4)根据乘法分配律进行计算,
(5)把101写成(102-1)再根据乘法分配律进行计算,
(6)先算除法,再算减法.
解答:解:(1)24×(
+
+
),
=24×
+24×
+24×
,
=9+4+10,
=23;
(2)
×7÷
,
=
×7×
,
=11;
(3)2.8×(
+
),
=2.8×
+2.8×
,
=0.4+0.3,
=0.7;
(4)23×
+14×
,
=23×
+16×
,
=(23+16)×
,
=39×
,
=14;
(5)101×
,
=(102-1)×
,
=102×
-
,
=99-
,
=98
;
(6)6÷
-
÷6,
=20-
,
=19
.
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=24×
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=9+4+10,
=23;
(2)
| 11 |
| 12 |
| 7 |
| 12 |
=
| 11 |
| 12 |
| 12 |
| 7 |
=11;
(3)2.8×(
| 1 |
| 7 |
| 3 |
| 28 |
=2.8×
| 1 |
| 7 |
| 3 |
| 28 |
=0.4+0.3,
=0.7;
(4)23×
| 14 |
| 39 |
| 16 |
| 39 |
=23×
| 14 |
| 39 |
| 14 |
| 39 |
=(23+16)×
| 14 |
| 39 |
=39×
| 14 |
| 39 |
=14;
(5)101×
| 99 |
| 102 |
=(102-1)×
| 99 |
| 102 |
=102×
| 99 |
| 102 |
| 99 |
| 102 |
=99-
| 99 |
| 102 |
=98
| 1 |
| 34 |
(6)6÷
| 3 |
| 10 |
| 3 |
| 10 |
=20-
| 1 |
| 20 |
=19
| 19 |
| 20 |
点评:本题主要考查了学生分数四则运算的计算能力,以及在计算中灵活运用简便算法的计算能力.
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