巧妙算.(1)101÷10111-11110(2)12+16+112+120+130+142.-数学

题目简介

巧妙算.(1)101÷10111-11110(2)12+16+112+120+130+142.-数学

题目详情

巧妙算.
(1)101÷
10
111
-11
1
10

(2)
1
2
+
1
6
+
1
12
+
1
20
+
1
30
+
1
42
题型:解答题难度:中档来源:不详

答案

(1)101÷class="stub"10
111
-11class="stub"1
10

=101×class="stub"111
10
-class="stub"111
10

=(101-1)×class="stub"111
10

=100×class="stub"111
10

=1110;

(2)class="stub"1
2
+class="stub"1
6
+class="stub"1
12
+class="stub"1
20
+class="stub"1
30
+class="stub"1
42

=class="stub"1
1×2
+class="stub"1
2×3
+class="stub"1
3×4
+class="stub"1
4×5
+class="stub"1
5×6
+class="stub"1
6×7

=1-class="stub"1
2
+class="stub"1
2
-class="stub"1
3
+class="stub"1
3
-class="stub"1
4
+class="stub"1
5
-class="stub"1
6
+class="stub"1
6
-class="stub"1
7

=1-class="stub"1
7

=class="stub"6
7

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