问题 解答题
采用灵活、简捷的方法计算
(1)95.6×19-95.6×9(2)(30+
5
14
)÷15
(3)4-1÷3-
1
3
×8
(4)18
9
20
÷9
(5)
1
5
×7.5+(1+
1
5
)×3
(6)3.2×12.5.
答案

(1)95.6×19-95.6×9,

=95.6×(19-9),

=95.6×10,

=956;

(2)(30+

5
14
)÷15,

=(30+

5
14
)×
1
15

=30×

1
15
+
5
14
×
1
15

=2+

1
42

=2

1
42

(3)4-1÷3-

1
3
×8,

=4-

1
3
-
8
3

=4-(

1
3
+
8
3
),

=4-3,

=1;

(4)18

9
20
÷9,

=18

9
20
×
1
9

=(18+

9
20
)×
1
9

=18×

1
9
+
9
20
×
1
9

=2+

1
20

=2

1
20

(5)

1
5
×7.5+(1+
1
5
)×3,

=

1
5
×7.5+
6
5
×3,

=1.5+3.6,

=5.1;

(6)3.2×12.5,

=0.4×8×12.5,

=0.4×(8×12.5),

=0.4×100,

=40.

单项选择题
判断题