题目内容
能简算的要简算
|
24÷0.8÷
|
| ||||||||||||||||||||
2-
|
0.2-(
|
[
|
分析:(1)先算除法,再算加法,
(2)从左向右进行计算即可,
(3)把除以4化成乘以
,再运用乘法分配律进行简算,
(4)先算除法,再运用减法的运算定律进行简算,
(5)先算(
-
)×
运用乘法分配律进行简算,再算减法,
(6)先算中括号里的乘除法,再算中括号里的加法,最后算括号外的除法.
(2)从左向右进行计算即可,
(3)把除以4化成乘以
| 1 |
| 4 |
(4)先算除法,再运用减法的运算定律进行简算,
(5)先算(
| 1 |
| 2 |
| 1 |
| 6 |
| 3 |
| 5 |
(6)先算中括号里的乘除法,再算中括号里的加法,最后算括号外的除法.
解答:解:(1)
+
÷3,
=
+
,
=
;
(2)24÷0.8÷
,
=30÷
,
=75;
(3)
×
+
÷4,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)2-
÷
-
,
=2-
-
,
=2-(
+
),
=2-1,
=1;
(5)0.2-(
-
)×
,
=0.2-(
×
-
×
),
=0.2-(
-
),
=0.2-
,
=0;
(6)[
÷
×
+200%]÷
,
=[
×
+200%]÷
,
=[
+200%]÷
,
=2
÷
,
=
.
| 1 |
| 4 |
| 3 |
| 4 |
=
| 1 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 2 |
(2)24÷0.8÷
| 2 |
| 5 |
=30÷
| 2 |
| 5 |
=75;
(3)
| 3 |
| 4 |
| 8 |
| 13 |
| 8 |
| 13 |
=
| 3 |
| 4 |
| 8 |
| 13 |
| 8 |
| 13 |
| 1 |
| 4 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 8 |
| 13 |
=1×
| 8 |
| 13 |
=
| 8 |
| 13 |
(4)2-
| 7 |
| 12 |
| 7 |
| 8 |
| 1 |
| 3 |
=2-
| 2 |
| 3 |
| 1 |
| 3 |
=2-(
| 2 |
| 3 |
| 1 |
| 3 |
=2-1,
=1;
(5)0.2-(
| 1 |
| 2 |
| 1 |
| 6 |
| 3 |
| 5 |
=0.2-(
| 1 |
| 2 |
| 3 |
| 5 |
| 1 |
| 6 |
| 3 |
| 5 |
=0.2-(
| 3 |
| 10 |
| 1 |
| 10 |
=0.2-
| 2 |
| 10 |
=0;
(6)[
| 2 |
| 3 |
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 3 |
=[
| 4 |
| 5 |
| 2 |
| 3 |
| 1 |
| 3 |
=[
| 8 |
| 15 |
| 1 |
| 3 |
=2
| 8 |
| 15 |
| 1 |
| 3 |
=
| 38 |
| 5 |
点评:此题考查了分数、小数、百分数四则混合运算的顺序,要根据算式的特点灵活运用运算定律进行简算.
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