题目内容
(2006?金湖县)
脱式计算(怎么简便怎么算) (6105-435)÷14 |
46.71-6.81-3.19 | 100-45÷0.9+0.75 | ||||||||||||||||||||
63×(
|
|
|
分析:(1)按运算顺序进行计算,先算括号内的,再算括号外的;
(2)运用减法的性质进行简算;
(3)按运算顺序进行计算,先算除法,再算减法和加法;
(4)运用乘法分配律简算;
(5)先把除法改为乘法,但不能进行简算,要按运算顺序计算,先算乘法,再算加法;
(6)中括号内用减法的性质简算,然后算括号外的.
(2)运用减法的性质进行简算;
(3)按运算顺序进行计算,先算除法,再算减法和加法;
(4)运用乘法分配律简算;
(5)先把除法改为乘法,但不能进行简算,要按运算顺序计算,先算乘法,再算加法;
(6)中括号内用减法的性质简算,然后算括号外的.
解答:解:(1)(6105-435)÷14,
=5670÷14,
=405;
(2)46.71-6.81-3.19,
=46.71-(6.81+3.19),
=46.71-10,
=36.71;
(3)100-45÷0.9+0.75,
=100-50+0.75,
=50+0.75,
=50.75;
(4)63×(
+
),
=63×
+63×
,
=28+45,
=73;
(5)
×
+
÷
,
=
×
+
×
,
=
+
,
=
+
,
=
;
(6)
×[
-(
-
)],
=
×[
+
-
],
=
×[1-
],
=
×
,
=
.
=5670÷14,
=405;
(2)46.71-6.81-3.19,
=46.71-(6.81+3.19),
=46.71-10,
=36.71;
(3)100-45÷0.9+0.75,
=100-50+0.75,
=50+0.75,
=50.75;
(4)63×(
4 |
9 |
5 |
7 |
=63×
4 |
9 |
5 |
7 |
=28+45,
=73;
(5)
3 |
5 |
5 |
6 |
1 |
6 |
3 |
5 |
=
3 |
5 |
5 |
6 |
1 |
6 |
5 |
3 |
=
1 |
2 |
5 |
18 |
=
9 |
18 |
5 |
18 |
=
7 |
9 |
(6)
3 |
5 |
3 |
4 |
7 |
12 |
1 |
4 |
=
3 |
5 |
3 |
4 |
1 |
4 |
7 |
12 |
=
3 |
5 |
7 |
12 |
=
3 |
5 |
5 |
12 |
=
1 |
4 |
点评:此题考查了学生对分数混合运算顺序的掌握情况,以及运用运算定律和性质进行简算的能力.
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