题目内容

5
7
×16.31-
5
7
×2.31      
2-
6
13
÷
9
26
-
2
3
        
1
5
+
4
5
÷
2
5
3.14×0.52+3.14×(2.5×0.3) 25.12÷(3.14×22 )
(1)
5
7
×16.31-
5
7
×2.31,
=
5
7
×(16.31-2.31),
=
5
7
×14,
=10;

(2)2-
6
13
÷
9
26
-
2
3

=2-
4
3
-
2
3

=2-(
4
3
+
2
3
),
=2-2,
=0;

(3)
1
5
+
4
5
÷
2
5

=
1
5
+2,
=2
1
5


(4)3.14×0.52+3.14×(2.5×0.3),
=3.14×(0.52+2.5×0.3),
=3.14×(0.25+0.75),
=3.14×1,
=3.14;

(5)25.12÷(3.14×22),
=25.12÷(3.14×4),
=25.12÷3.14÷4,
=8÷4,
=2.
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