题目内容
(2012?蜀山区)0.125×0.25×32
(
+
+
)×48
×
+
÷
.
(
1 |
3 |
1 |
4 |
1 |
5 |
7 |
4 |
5 |
8 |
1 |
4 |
8 |
5 |
分析:(1)把原式变形为0.125×0.25×8×4,然后根据乘法的交换结合律简算;
(2)根据乘法的分配律进行简算即可;
(3)把原式变形为:
×
+
×
然后根据乘法的分配律简算.
(2)根据乘法的分配律进行简算即可;
(3)把原式变形为:
7 |
4 |
5 |
8 |
1 |
4 |
5 |
8 |
解答:解:(1)0.125×0.25×32,
=0.125×0.25×8×4,
=(0.125×8)×(0.25×4),
=1×1,
=1;
(2)(
+
+
)×48,
=
×48+
×48+
×48,
=16+12+9.6,
=37.6;
(3)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=2×
,
=1.25.
=0.125×0.25×8×4,
=(0.125×8)×(0.25×4),
=1×1,
=1;
(2)(
1 |
3 |
1 |
4 |
1 |
5 |
=
1 |
3 |
1 |
4 |
1 |
5 |
=16+12+9.6,
=37.6;
(3)
7 |
4 |
5 |
8 |
1 |
4 |
8 |
5 |
=
7 |
4 |
5 |
8 |
1 |
4 |
5 |
8 |
=(
7 |
4 |
1 |
4 |
5 |
8 |
=2×
5 |
8 |
=1.25.
点评:此题主要考查运用乘法的运算定律进行简算,注意要细心.
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