题目内容
计算下列各题(能简算的一定要简算)
24×(
|
|
1-
|
分析:(1)根据乘法分配律进行计算;
(2)根据乘法分配律进行计算;
(3)根据题意,前一个数正好是下一个数的2倍,按照从左向右的顺序进行计算即可.
(2)根据乘法分配律进行计算;
(3)根据题意,前一个数正好是下一个数的2倍,按照从左向右的顺序进行计算即可.
解答:解:(1)24×(
+
-
),
=24×
+24×
-24×
,
=6+3-4,
=9-4,
=5;
(2)
×0.86+14%÷
,
=
×0.86+0.14×
,
=
×(0.86+0.14),
=
×1,
=
;
(3)1-
-
-
-
-
-
,
=
-
-
-
-
-
,
=
-
-
-
-
,
=
-
-
-
,
=
-
-
,
=
-
,
=
.
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 6 |
=24×
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 6 |
=6+3-4,
=9-4,
=5;
(2)
| 7 |
| 12 |
| 12 |
| 7 |
=
| 7 |
| 12 |
| 7 |
| 12 |
=
| 7 |
| 12 |
=
| 7 |
| 12 |
=
| 7 |
| 12 |
(3)1-
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
=
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
=
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
=
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
=
| 1 |
| 32 |
| 1 |
| 64 |
=
| 1 |
| 64 |
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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