题目内容
计算下面各题,能简算的用简便方法计算.
×
+
÷
12×8.9+1.2×11
20÷(
+
).
| 4 |
| 5 |
| 11 |
| 15 |
| 4 |
| 5 |
| 15 |
| 4 |
12×8.9+1.2×11
20÷(
| 1 |
| 4 |
| 1 |
| 20 |
分析:(1)(2)运用乘法分配律解答,
(3)按照先算括号里面的,在算括号外面的顺序解答.
(3)按照先算括号里面的,在算括号外面的顺序解答.
解答:解:(1)
×
+
÷
,
=(
+
)×
,
=1×
,
=
;
(2)12×8.9+1.2×11,
=12×(8.9+1.1),
=12×10,
=120;
(3)20÷(
+
),
=20÷
,
=66
.
| 4 |
| 5 |
| 11 |
| 15 |
| 4 |
| 5 |
| 15 |
| 4 |
=(
| 11 |
| 15 |
| 4 |
| 15 |
| 4 |
| 5 |
=1×
| 4 |
| 5 |
=
| 4 |
| 5 |
(2)12×8.9+1.2×11,
=12×(8.9+1.1),
=12×10,
=120;
(3)20÷(
| 1 |
| 4 |
| 1 |
| 20 |
=20÷
| 3 |
| 10 |
=66
| 2 |
| 3 |
点评:本题主要考查学生依据四则运算顺序正确进行计算,以及正确运用乘法分配律解决问题的能力.
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