题目内容
能简算的要简算
[
|
(
| ||||||||||||||
|
|
分析:(1)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序解答,
(2)(3)(4)运用乘法分配律解答.
(2)(3)(4)运用乘法分配律解答.
解答:解:(1)[
+(
-
)]÷
,
=[
+
]÷
,
=
÷
,
=1.5;
(2)(
+
)×56,
=
×56+
×56,
=40+21,
=61;
(3)
×
+
÷
,
=(
+
)×
,
=1×
,
=1
;
(4)
+
×3.5+
×5.5,
=
+(3.5+5.5)×
,
=
+9×
,
=
+2,
=2
.
| 1 |
| 4 |
| 4 |
| 5 |
| 3 |
| 10 |
| 1 |
| 2 |
=[
| 1 |
| 4 |
| 5 |
| 10 |
| 1 |
| 2 |
=
| 3 |
| 4 |
| 1 |
| 2 |
=1.5;
(2)(
| 5 |
| 7 |
| 3 |
| 8 |
=
| 5 |
| 7 |
| 3 |
| 8 |
=40+21,
=61;
(3)
| 3 |
| 4 |
| 13 |
| 7 |
| 1 |
| 4 |
| 7 |
| 13 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 13 |
| 7 |
=1×
| 13 |
| 7 |
=1
| 6 |
| 7 |
(4)
| 2 |
| 9 |
| 2 |
| 9 |
| 2 |
| 9 |
=
| 2 |
| 9 |
| 2 |
| 9 |
=
| 2 |
| 9 |
| 2 |
| 9 |
=
| 2 |
| 9 |
=2
| 2 |
| 9 |
点评:本题考查知识点:(1)正确按照四则运算顺序进行计算,(2)正确运用简便算法进行计算.
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