题目内容

(2011?富源县模拟)怎样简便就怎样计算.
①4×
2
7
+4÷
7
5
                    ②5×
1
3
×
4
5
×
3
10
                 ③41×101
④8.5-(5.6+4.8)÷1.3          ⑤12×(
1
4
+
1
6
-
1
3
)          ⑥
11
13
-(
8
9
-
1
13
分析:(1)(3)(5)运用乘法分配律解答,
(2)运用乘法交换律和结合律解答,
(4)依据四则运算顺序解答,
(6)运用减法性质解答.
解答:解:①4×
2
7
+4÷
7
5

=(
2
7
+
5
7
)×4,
=1×4,
=4;

②5×
1
3
×
4
5
×
3
10

=(5×
4
5
)×(
1
3
×
3
10
),
=4×
1
10

=
2
5


③41×101,
=41×100+41×1,
=4100+41,
=4141;

④8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;

⑤12×(
1
4
+
1
6
-
1
3
),
=12×
1
4
+12×
1
6
-12×
1
3

=3+2-4,
=1;

11
13
-(
8
9
-
1
13
),
=
11
13
+
1
13
-
8
9

=
12
13
-
8
9

=
4
117
点评:(1)正确运用简便方法解决问题,(2)依据四则运算顺序进行计算是本题考查知识点.
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