题目内容

(2012?黔东南州模拟)
口算.
18÷
3
5
÷
2
3
=
45
45
1-
5
7
×
21
25
=
2
5
2
5
4-(
1
4
+
3
8
)=
3
3
8
3
3
8
1
3
÷
3
4
=
4
9
4
9
4
5
+
1
4
)÷
7
3
+
7
10
=
23
20
23
20
1
6
+
1
2
)÷
6
7
=
7
9
7
9
分析:①④把除法改写为乘法,约分计算;
②先算乘法,再算减法;
③⑥先算括号内的,再算括号外的;
⑤先算括号内的,再算括号外的除法,最后算括号外的加法.
解答:解:18÷
3
5
÷
2
3
=45;              1-
5
7
×
21
25
=
2
5
;                  4-(
1
4
+
3
8
)=3
3
8

1
3
÷
3
4
=
4
9
;                     (
4
5
+
1
4
)÷
7
3
+
7
10
=
23
20
;       (
1
6
+
1
2
)÷
6
7
=
7
9

故答案为:45,
2
5
,3
3
8
4
9
23
20
7
9
点评:考查了四则混合运算,注意运算顺序和运算法则.
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