题目内容
用简便方法计算
×
+
÷7
×
-
÷3
(
+
)÷
73×
+
×27.
| 1 |
| 7 |
| 3 |
| 5 |
| 2 |
| 5 |
| 15 |
| 16 |
| 1 |
| 3 |
| 3 |
| 8 |
(
| 7 |
| 8 |
| 13 |
| 16 |
| 13 |
| 16 |
73×
| 3 |
| 5 |
| 3 |
| 5 |
分析:(1)(2)把除法改为乘法,运用乘法分配律的逆运算简算;
(3)把除法改为乘法,运用乘法分配律简算;
(4)运用乘法分配律的逆运算简算.
(3)把除法改为乘法,运用乘法分配律简算;
(4)运用乘法分配律的逆运算简算.
解答:解:(1)
×
+
÷7,
=
×
+
×
,
=
×
×2,
=
;
(2)
×
-
÷3,
=
×
-
×
,
=(
-
)×
,
=
×
,
=
;
(3)(
+
)÷
,
=(
+
)×
,
=
×
+
×
,
=1
+1,
=2
;
(4)73×
+
×27,
=(73+27)×
,
=100×
,
=60.
| 1 |
| 7 |
| 2 |
| 5 |
| 2 |
| 5 |
=
| 1 |
| 7 |
| 2 |
| 5 |
| 2 |
| 5 |
| 1 |
| 7 |
=
| 2 |
| 5 |
| 1 |
| 7 |
=
| 4 |
| 35 |
(2)
| 15 |
| 16 |
| 1 |
| 3 |
| 3 |
| 8 |
=
| 15 |
| 16 |
| 1 |
| 3 |
| 3 |
| 8 |
| 1 |
| 3 |
=(
| 15 |
| 16 |
| 3 |
| 8 |
| 1 |
| 3 |
=
| 9 |
| 16 |
| 1 |
| 3 |
=
| 3 |
| 16 |
(3)(
| 7 |
| 8 |
| 13 |
| 16 |
| 13 |
| 16 |
=(
| 7 |
| 8 |
| 13 |
| 16 |
| 16 |
| 13 |
=
| 7 |
| 8 |
| 16 |
| 13 |
| 13 |
| 16 |
| 16 |
| 13 |
=1
| 1 |
| 13 |
=2
| 1 |
| 13 |
(4)73×
| 3 |
| 5 |
| 3 |
| 5 |
=(73+27)×
| 3 |
| 5 |
=100×
| 3 |
| 5 |
=60.
点评:此题主要考查应用乘法分配律进行简便计算.
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