题目内容
下面各题,怎样简便怎样算.
|
24×(
| ||||||||
(
|
| ||||||||
1-
|
|
分析:(1)按照从左向右的顺序进行计算;
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)先算除法,再算减法;
(6)按照从左向右的顺序进行计算.
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)先算除法,再算减法;
(6)按照从左向右的顺序进行计算.
解答:解:(1)
÷10÷
=
÷
=6;
(2)24×(
-
)
=24×
-24×
=20-9
=11;
(3)(
+0.25)÷
=(
+0.25)×
=
×
+0.25×
=
+
=
;
(4)
+
×16
=
×(1+16)
=
×17
=4;
(5)1-
÷
=1-
=
;
(6)
×8÷
=
÷
=2.
| 5 |
| 3 |
| 1 |
| 36 |
=
| 1 |
| 6 |
| 1 |
| 36 |
=6;
(2)24×(
| 5 |
| 6 |
| 3 |
| 8 |
=24×
| 5 |
| 6 |
| 3 |
| 8 |
=20-9
=11;
(3)(
| 2 |
| 3 |
| 11 |
| 18 |
=(
| 2 |
| 3 |
| 18 |
| 11 |
=
| 2 |
| 3 |
| 18 |
| 11 |
| 18 |
| 11 |
=
| 12 |
| 11 |
| 9 |
| 22 |
=
| 3 |
| 2 |
(4)
| 4 |
| 17 |
| 4 |
| 17 |
=
| 4 |
| 17 |
=
| 4 |
| 17 |
=4;
(5)1-
| 7 |
| 9 |
| 7 |
| 8 |
=1-
| 8 |
| 9 |
=
| 1 |
| 9 |
(6)
| 1 |
| 5 |
| 4 |
| 5 |
=
| 8 |
| 5 |
| 4 |
| 5 |
=2.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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| ①9 | ②1.8× |
| ③(8 | ④2 |