题目内容

①0.65×6.4-6.5×0.54+65×9%
②12.5×0.56+1.4÷
2
5

1
2
+
5
6
+
11
12
+
19
20
+
29
30
+
41
42
+
55
56
+
71
72
+
89
90
(1)0.65×6.4-6.5×0.54+65×9%,
=0.65×6.4-0.65×5.4+0.65×9,
=0.65×(6.4-5.4+9),
=0.65×10,
=6.5;

(2)12.5×0.56+1.4÷
2
5

=7+3.5,
=10.5;

(3)
1
2
+
5
6
+
11
12
+
19
20
+
29
30
+
41
42
+
55
56
+
71
72
+
89
90

=
1
2
+
1
2
+
1
3
+
2
3
+
1
4
+
3
4
+
1
5
+
4
5
+
1
6
+
5
6
+
1
7
+
6
7
+
1
8
+
7
8
+
1
9
+
8
9
+
1
10

=1+1+1+1+1+1+1+1+
1
10

=8
1
10
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