问题 解答题
脱式计算(能用简便方法的要用简便方法):
1
7
+
5
14
)÷
5
14
13
18
╳19-
13
18
3
4
+
5
8
)×32
7
9
÷
2
3
÷
7
8
3
11
×87+12÷
11
3
答案

①(
1
7
+
5
14
)÷
5
14

=

1
2
÷
5
14

=

1
2
×
14
5

=

7
5

13
18
×19-
13
18

=

13
18
×(19-1),

=

13
18
×18,

=13;

③(

3
4
+
5
8
)×32,

=

3
4
×32+
5
8
×32,

=24+20,

=44;

7
9
÷
2
3
÷
7
8

=

7
9
×
3
2
×
8
7

=

4
3

3
11
×87+12÷
11
3

=
3
11
×87+12×
3
11

=

3
11
×(87+12),

=

3
11
×99,

=27.

单项选择题 A3/A4型题
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