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×(
4
9
+
5
7
)           
3
5
×
5
6
+
1
6
÷
3
5
2
5
×〔
3
4
-(
7
12
-
1
4
)〕
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.
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×(
4
9
+
5
7
),
=63×
4
9
+63×
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
×[1-
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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