38×45-38÷54=38×8÷38×8=15+6÷16-15=6÷5×56=4×78×27=

2021-09-10 02:21:51作者:黑骡子网 阅读量:32

3
8
×
4
5
-
3
8
÷
5
4
=
3
8
×8÷
3
8
×8=
1
5
+6÷
1
6
-
1
5
=
6÷5×
5
6
=
7
8
×
2
7
=

试卷题目答案

分析:(1)按照先同时计算第二级运算,再算第一级运算顺序解答,
(2)运用乘法交换律和结合律解答,
(3)运用加法交换律解答,
(4)(5)按照从左到右顺序解答.解答:解:(1)
3
8
×
4
5
-
3
8
÷
5
4

=
3
10
-
3
10

=0;

(2)
3
8
×8÷
3
8
×8
=(
3
8
÷
3
8
)×(8×8)
=1×64
=64;

(3)
1
5
+6÷
1
6
-
1
5

=(
1
5
-
1
5
)+6÷
1
6

=0+36
=36;

(4)6÷5×
5
6

=
6
5
×
5
6

=1;

(5)4×
7
8
×
2
7

=
7
2
×
2
7

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