题目内容

简算
5.61-
2
5
+4.39-1
3
5
             
3.74×5.8+62.6×0.58
1
2
-
1
3
)+(
1
4
-
1
5
)+(
1
7
-
1
10
)+(
1
14
-
1
15
)+(
1
28
-
1
30
(1)5.61-
2
5
+4.39-1
3
5

=(5.61+4.39)-(
2
5
+1
3
5
),
=10-2,
=8;

(2)3.74×5.8+62.6×0.58,
=3.74×5.8+6.26×5.8,
=(3.74+6.26)×5.8,
=10×5.8,
=58;

(3)(
1
2
-
1
3
)+(
1
4
-
1
5
)+(
1
7
-
1
10
)+(
1
14
-
1
15
)+(
1
28
-
1
30
),
=(
1
2
+
1
4
+
1
7
+
1
14
+
1
28
)-(
1
3
+
1
5
+
1
10
+
1
15
+
1
30
),
=
28
28
-
22
30

=1-
11
15

=
4
15
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