题目内容

能简算要简算
3
8
×95+
3
8
+
3
8
4
9
×
2
5
+
5
9
×
2
5
8
15
+
7
12
+
11
30
)×60
7
6
÷
21
20
×
3
4
10
11
×
1
5
+
1
5
÷11
7
13
+6.7+
6
13
+4.3.
分析:(1)(2)(3)(5)运用乘法分配律解答,
(4)按照从左到右顺序解答,
(6)运用加法交换律和结合律解答.
解答:解:(1)
3
8
×95+
3
8
+
3
8

=
3
8
×(95+1)+
3
8

=
3
8
×96+
3
8

=36+
3
8

=36
3
8


(2)
4
9
×
2
5
+
5
9
×
2
5

=(
4
9
+
5
9
)×
2
5

=1×
2
5

=
2
5


(3)(
8
15
+
7
12
+
11
30
)×60
=
8
15
×60+
7
12
×60+
11
30
×60
=32+35+22
=89;

(4)
7
6
÷
21
20
×
3
4

=
10
9
×
3
4

=
5
6


(5)
10
11
×
1
5
+
1
5
÷11
=(
10
11
+
1
11
)×
1
5

=1×
1
5

=
1
5


(6)
7
13
+6.7+
6
13
+4.3
=(
7
13
+
6
13
)+(6.7+4.3)
=1+11
=12.
点评:(1)依据四则运算计算方法正确进行计算,(2)正确运用简便方法解决问题,是本题考查知识点.
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