题目内容
计算下面各题,注意使用简便方法.
|
|
(15-15×
| ||||||||||||||||||
[
|
(34+
|
(
|
分析:(1)(3)(6)依据先算第二级运算,再算第一级运算你,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的顺序解答;
(2)(5)运用乘法分配律解答;
(4)先跟据0除以任何数都得0,求出括号里面的值,再依据分数乘法计算方法解答.
(2)(5)运用乘法分配律解答;
(4)先跟据0除以任何数都得0,求出括号里面的值,再依据分数乘法计算方法解答.
解答:解:(1)
×
÷
,
=
÷
,
=
;
(2)
×
+
÷8,
=(
+
)×
,
=1×
,
=
;
(3)(15-15×
)×
,
=(15-12)×
,
=3×
,
=
;
(4)[
-0÷(
+
)]×
,
=[
-0]×
,
=
×
,
=
;
(5)(34+
)÷17,
=34×
+
×
,
=2+
,
=2
;
(6)(
+
)×
÷
,
=
×
÷
,
=
÷
,
=
.
| 4 |
| 11 |
| 1 |
| 7 |
| 4 |
| 7 |
=
| 4 |
| 77 |
| 4 |
| 7 |
=
| 1 |
| 11 |
(2)
| 11 |
| 21 |
| 1 |
| 8 |
| 10 |
| 21 |
=(
| 11 |
| 21 |
| 10 |
| 21 |
| 1 |
| 8 |
=1×
| 1 |
| 8 |
=
| 1 |
| 8 |
(3)(15-15×
| 4 |
| 5 |
| 7 |
| 24 |
=(15-12)×
| 7 |
| 24 |
=3×
| 7 |
| 24 |
=
| 7 |
| 8 |
(4)[
| 4 |
| 5 |
| 1 |
| 3 |
| 2 |
| 5 |
| 5 |
| 8 |
=[
| 4 |
| 5 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 5 |
| 8 |
=
| 1 |
| 2 |
(5)(34+
| 34 |
| 47 |
=34×
| 1 |
| 17 |
| 34 |
| 47 |
| 1 |
| 17 |
=2+
| 2 |
| 47 |
=2
| 2 |
| 47 |
(6)(
| 5 |
| 6 |
| 2 |
| 9 |
| 4 |
| 5 |
| 19 |
| 20 |
=
| 57 |
| 54 |
| 4 |
| 5 |
| 19 |
| 20 |
=
| 114 |
| 135 |
| 19 |
| 20 |
=
| 8 |
| 9 |
点评:本题考查知识点:(1)依据四则运算计算顺序正确进行计算,(2)乘法分配律运用.
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| ( | ||
| 13-13× | ( | [ |