①0.65×6.4-6.5×0.54+65×9%②12.5×0.56+1.4÷25③12+56+1112+1920+2930+4142+5556+7172+8990.-数学

题目简介

①0.65×6.4-6.5×0.54+65×9%②12.5×0.56+1.4÷25③12+56+1112+1920+2930+4142+5556+7172+8990.-数学

题目详情

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
题型:解答题难度:中档来源:不详

答案

(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÷class="stub"2
5

=7+3.5,
=10.5;

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

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

=1+1+1+1+1+1+1+1+class="stub"1
10

=8class="stub"1
10

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