问题 解答题
计算下列各题(能简算的写出简算过程)
1
8
+
5
7
+6.875+
2
7
7
9
÷
11
5
+
2
9
×
5
11

1
3
÷(
2
3
-
2
5
)×
3
5
4.82-5.2÷0.8×0.6.
答案

(1)

1
8
+
5
7
+6.875+
2
7

=

1
8
+
5
7
+
6
7
8
+
2
7

=(

1
8
+6
7
8
)+(
5
7
+
2
7
),

=7+1,

=8;

(2)

7
9
÷
11
5
+
2
9
×
5
11

=

7
9
×
5
11
+
2
9
×
5
11

=

5
11
×(
7
9
+
2
9
),

=

5
11
×1,

=

5
11

(3)

1
3
÷(
2
3
-
2
5
)×
3
5

=

1
3
÷(
10
15
-
6
15
)×
3
5

=

1
3
÷
4
15
×
3
5

=

1
3
×
15
4
×
3
5

=

3
4

(4)4.82-5.2÷0.8×0.6,

=4.82-6.5×0.6,

=4.82-3.9,

=0.92.

单项选择题
判断题