计算下面各题:(1)20.02×67+3.2×200.2+400.4×0.05(2)13+115+135+163+199.-数学

题目简介

计算下面各题:(1)20.02×67+3.2×200.2+400.4×0.05(2)13+115+135+163+199.-数学

题目详情

计算下面各题:
(1)20.02×67+3.2×200.2+400.4×0.05
(2)
1
3
+
1
15
+
1
35
+
1
63
+
1
99
题型:解答题难度:中档来源:不详

答案


(1)20.02×67+3.2×200.2+400.4×0.05
=200.2×6.7+3.2×200.2+200.2×2×0.05
=200.2×6.7+3.2×200.2+200.2×0.1
=200.2×(6.7+3.2+0.1)
=200.2×10
=2002,
(2)class="stub"1
3
+class="stub"1
15
+class="stub"1
35
+class="stub"1
63
+class="stub"1
99

=class="stub"1
2
×(1-class="stub"1
3
)+class="stub"1
2
×(class="stub"1
3
-class="stub"1
5
)+class="stub"1
2
×(class="stub"1
5
-class="stub"1
7
)+class="stub"1
2
×(class="stub"1
7
-class="stub"1
9
)+class="stub"1
2
×(class="stub"1
9
-class="stub"1
11

=class="stub"1
2
×(1-class="stub"1
3
+class="stub"1
3
-class="stub"1
5
+class="stub"1
5
-class="stub"1
7
+class="stub"1
7
-class="stub"1
9
+class="stub"1
9
-class="stub"1
11

=class="stub"1
2
×(1-class="stub"1
11

=class="stub"1
2
×class="stub"10
11

=class="stub"5
11

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