题目内容

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
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
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