题目内容
简算
×
+
÷
47×
0.375×(0.75+
+
)
×
×4.8×51.
| 5 |
| 9 |
| 7 |
| 12 |
| 13 |
| 9 |
| 12 |
| 7 |
47×
| 5 |
| 48 |
0.375×(0.75+
| 8 |
| 3 |
| 1 |
| 4 |
| 5 |
| 8 |
| 2 |
| 17 |
分析:算式(1)可将式的除法算式变为乘法算式后根据乘法分配律进行计算;
算式(4)可将式的47变为48-1后,再根据乘法分配律进行计算;
算式(3)可将式中的小数化为分数后根据加法交换律及乘法分配律进行计算;
算式(4)可根据乘法交换律及结合律进行计算.
算式(4)可将式的47变为48-1后,再根据乘法分配律进行计算;
算式(3)可将式中的小数化为分数后根据加法交换律及乘法分配律进行计算;
算式(4)可根据乘法交换律及结合律进行计算.
解答:解:(1)
×
+
÷
=
×
+
×
,
=(
+
)×
=2×
,
=
;
(2)(48-1)×
=48×
-
,
=5-
,
=4
;
(3)0.375×(0.75+
+
)
=
×(
+
+
),
=
×(1+
),
=
×1+
×
,
=
+1,
=1
;
(4)
×
×4.8×51;
=(
×4.8)×(
×51),
=3×6,
=18.
| 5 |
| 9 |
| 7 |
| 12 |
| 13 |
| 9 |
| 12 |
| 7 |
=
| 5 |
| 9 |
| 7 |
| 12 |
| 13 |
| 9 |
| 7 |
| 12 |
=(
| 5 |
| 9 |
| 13 |
| 9 |
| 7 |
| 12 |
=2×
| 7 |
| 12 |
=
| 7 |
| 6 |
(2)(48-1)×
| 5 |
| 48 |
=48×
| 5 |
| 48 |
| 5 |
| 48 |
=5-
| 5 |
| 48 |
=4
| 43 |
| 48 |
(3)0.375×(0.75+
| 8 |
| 3 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
| 8 |
| 3 |
=
| 3 |
| 8 |
| 8 |
| 3 |
=
| 3 |
| 8 |
| 3 |
| 8 |
| 8 |
| 3 |
=
| 3 |
| 8 |
=1
| 3 |
| 8 |
(4)
| 5 |
| 8 |
| 2 |
| 17 |
=(
| 5 |
| 8 |
| 2 |
| 17 |
=3×6,
=18.
点评:将算式中同时含有分数小数时,可根据式中数据的特点灵活将它们互化后再进行计算.
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