题目内容
(2010?江都市模拟)脱式计算,能简算的要简算
×
+
×
(
+
-
)×24
(
+
)÷
+
.
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 11 |
| 5 |
(
| 1 |
| 4 |
| 5 |
| 6 |
| 2 |
| 3 |
(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
分析:(1)(2)运用乘法分配律简算;(3)先算小括号里面的加法,再算括号外的除法,最后算加法.
解答:解:(1)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)(
+
-
)×24,
=
×24+
×24-
×24,
=6+20-16,
=26-16,
=10;
(3)(
+
)÷
+
,
=
÷
+
,
=
+
,
=
.
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 11 |
| 5 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 11 |
| 5 |
=1×
| 11 |
| 5 |
=
| 11 |
| 5 |
(2)(
| 1 |
| 4 |
| 5 |
| 6 |
| 2 |
| 3 |
=
| 1 |
| 4 |
| 5 |
| 6 |
| 2 |
| 3 |
=6+20-16,
=26-16,
=10;
(3)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 7 |
| 10 |
=
| 23 |
| 20 |
点评:乘法分配律是最常用的简便运算的方法,要熟练掌握,灵活运用.
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