问题 解答题
脱式计算(能简算要用简便方法计算).
(1)56×(
3
7
-
3
8
(2)9.75-3.42-5.58(3)2.1×0.5÷4.2
(4)
3
8
×
6
7
+
6
7
÷8
(5)(1-
8
15
×
1
2
)÷
4
5
(6)35÷[(
5
6
-
2
3
)×3].
答案

(1)56×(
3
7
-
3
8
),

=56×

3
7
-56×
3
8

=24-21,

=3;

(2)9.75-3.42-5.58,

=9.75-(3.42+5.58),

=9.75-9,

=0.75;

(3)2.1×0.5÷4.2,

=2.1÷4.2×0.5,

=0.5×0.5,

=0.25;

(4)
3
8
×
6
7
+
6
7
÷8,

=(

3
8
+
1
8
)×
6
7

=

1
2
×
6
7

=

3
7
(5)(1-
8
15
×
1
2
)÷
4
5

=

11
15
×
5
4

=

11
12

(6)35÷[(

5
6
-
2
3
)×3],

=35÷[

1
6
×3],

=35×2,

=70.

单项选择题 A1/A2型题
判断题