题目内容
简便计算:
|
0.125×0.25×32 | 24×(
|
2-
|
分析:(1)根据乘法分配律进行计算;
(2)根据乘法交换律和结合律进行计算;
(3)根据乘法分配律进行计算;
(4)先算除法,再根据连减的性质进行计算.
(2)根据乘法交换律和结合律进行计算;
(3)根据乘法分配律进行计算;
(4)先算除法,再根据连减的性质进行计算.
解答:解:
(1)
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)0.125×0.25×32,
=0.125×0.25×(4×8),
=(0.125×8)×(0.25×4),
=1×1,
=1;
(3)24×(
+
-
),
=24×
+24×
-24×
,
=6+4-8,
=10-8,
=2;
(4)2-
÷
-
,
=2-
-
,
=2-(
+
),
=2-2,
=0.
(1)
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=(
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
(2)0.125×0.25×32,
=0.125×0.25×(4×8),
=(0.125×8)×(0.25×4),
=1×1,
=1;
(3)24×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=24×
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=6+4-8,
=10-8,
=2;
(4)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2,
=0.
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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