题目内容

(2013?富源县模拟)怎样简便就怎样计算.
11
9
-(
2
9
+
7
13
)    
91-10÷0.25÷4
5
7
×
9
11
+
2
11
÷
7
5
35÷[
7
8
×(1-
2
7
)]
41×101
1
3
×
2
5
×
3
10
8.5-(5.6+4.8)÷1.3 12×(
1
4
-
1
3
+
1
6
分析:(1)根据连减的性质进行计算;
(2)根据连除的性质进行计算;
(3)根据乘法分配律进行计算;
(4)先算减法,再算乘法,最后算除法;
(5)根据乘法分配律进行计算;
(6)根据乘法交换律和结合律进行计算;
(7)先算加法,再算除法,最后算减法;
(8)根据乘法分配律进行计算.
解答:解:
(1)
11
9
-(
2
9
+
7
13
),
=
11
9
-
2
9
-
7
13

=1-
7
13

=
6
13


(2)91-10÷0.25÷4,
=91-10÷(0.25×4),
=91-10÷1,
=91-10,
=81;

(3)
5
7
×
9
11
+
2
11
÷
7
5

=
5
7
×
9
11
+
2
11
×
5
7

=(
9
11
+
2
11
)×
5
7

=1×
5
7

=
5
7


(4)35÷[
7
8
×(1-
2
7
)],
=35÷[
7
8
×
5
7
],
=35÷
5
8

=56;

(5)41×101,
=41×(100+1),
=41×100+41,
=4100+41,
=4141;

(6)5×
1
3
×
2
5
×
3
10

=(5×
2
5
)×(
1
3
×
3
10
),
=2×
1
10

=
1
5


(7)8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;

(8)12×(
1
4
-
1
3
+
1
6
),
=12×
1
4
-12×
1
3
+12×
1
6

=3-4+2,
=1.
点评:考查了运算定律与简便运算,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律简便计算.
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