题目内容

11
15
÷
5
3
+
4
15
×
3
5
②(
5
6
-
7
12
)×24+
1
3
③2.3×6.2-21÷5
5
8
÷
7
16
×
14
25
⑤12÷
4
9
+
1
6
×15      
4
5
÷[(
3
4
-
1
6
)×
4
7
].
分析:①、②可以运用乘法分配律进行简算,其余的按计算顺序和运算定律计算即可.
解答:解:
11
15
÷
5
3
+
4
15
×
3
5

=
11
15
×
3
5
+
4
15
×
3
5
=(
11
15
+
4
15
)×
3
5

=
3
5
;②(
5
6
-
7
12
)×24+
1
3

=
5
6
×24-
7
12
×24+
1
3

=20-14+
1
3

=6
1
3
;③2.3×6.2-21÷5,
=14.26-4.2,
=10.06;

5
8
÷
7
16
×
14
25

=
5
8
×
16
7
×
14
25

=
4
5


⑤12÷
4
9
+
1
6
×15,
=12×
9
4
+
5
2

=27+2
1
2

=29
1
2


4
5
÷[(
3
4
-
1
6
)×
4
7
],
=
4
5
÷[
7
12
×
4
7
],
=
4
5
÷
1
3

=
12
5
点评:计算时要细心,同时注意运用定律进行简算.
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