问题 解答题
脱式计算(能简算的要简算)
2-
3
10
-
5
8
÷
25
28
         
4×58+84×1.2       
2
23
×
8
17
+
9
23
×
2
17
                         
2
3
+(
4
5
+
1
5
)÷
1
3
答案

①2-

3
10
-
5
8
÷
25
28

=2-

3
10
-
7
10

=2-(

3
10
+
7
10
),

=2-1,

=1;

②4×58+84×1.2,

=232+100.8,

=332.8;

2
23
×
8
17
+
9
23
×
2
17

=

8
23
×
2
17
+
9
23
×
2
17

=

2
17
×(
8
23
+
9
23

=

2
17
×
17
23

=

2
23

2
3
+(
4
5
+
1
5
)÷
1
3

=

2
3
+1÷
1
3

=

2
3
+3,

=3

2
3

单项选择题
单项选择题