题目内容
脱式计算.(能简算的要简算)
|
36×(
|
1÷(
| ||||||||||||||||||||
|
|
|
分析:(1)从左往右依次计算,或直接约分计算;
(2)运用乘法分配律简算;
(3)先算括号内的,再算括号外的;
(4)把除法改为乘法,运用乘法分配律简算;
(5)把小数化为分数,把除法变为乘法,约分计算;
(6)先算小括号内的,再算中括号内的,最后算括号外的.
(2)运用乘法分配律简算;
(3)先算括号内的,再算括号外的;
(4)把除法改为乘法,运用乘法分配律简算;
(5)把小数化为分数,把除法变为乘法,约分计算;
(6)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)
×
×
=
×
=
(2)36×(
-
)
=36×
-
×36
=9-8
=1
(3)1÷(
+
)
=1÷
=
(4)
÷
+
×
=
×
+
×
=(
+
)×
=
×
=
(5)
×0.125÷
=
×
×
=
(6)
÷[(
+
)÷
]
=
÷[
×
]
=
÷
=
×
=
9 |
16 |
1 |
3 |
4 |
5 |
=
3 |
16 |
4 |
5 |
=
3 |
20 |
(2)36×(
1 |
4 |
2 |
9 |
=36×
1 |
4 |
2 |
9 |
=9-8
=1
(3)1÷(
1 |
6 |
2 |
3 |
=1÷
5 |
6 |
=
6 |
5 |
(4)
7 |
9 |
8 |
11 |
4 |
9 |
11 |
8 |
=
7 |
9 |
11 |
8 |
4 |
9 |
11 |
8 |
=(
7 |
9 |
4 |
9 |
11 |
8 |
=
11 |
9 |
11 |
8 |
=
121 |
72 |
(5)
5 |
6 |
7 |
24 |
=
5 |
6 |
1 |
8 |
24 |
7 |
=
5 |
14 |
(6)
1 |
2 |
1 |
3 |
1 |
4 |
7 |
5 |
=
1 |
2 |
7 |
12 |
5 |
7 |
=
1 |
2 |
5 |
12 |
=
1 |
2 |
12 |
5 |
=
6 |
5 |
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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