计算:56+2324+5960+8384+119120+209210=______.-数学

题目简介

计算:56+2324+5960+8384+119120+209210=______.-数学

题目详情

计算:
5
6
+
23
24
+
59
60
+
83
84
+
119
120
+
209
210
=______.
题型:填空题难度:中档来源:不详

答案

class="stub"5
6
=1-class="stub"1
6
class="stub"23
24
=1-class="stub"1
24
class="stub"59
60
=1-class="stub"1
60
class="stub"83
84
=1-class="stub"1
84
class="stub"119
120
=1-class="stub"1
120
class="stub"209
210
=1-class="stub"1
210

class="stub"1
6
=class="stub"1
1×2×3
class="stub"1
24
=class="stub"1
2×3×4
class="stub"1
60
=class="stub"1
3×4×5
class="stub"1
84
=class="stub"1
3×4×7
class="stub"1
120
=class="stub"1
4×5×6
class="stub"1
210
=class="stub"1
5×6×7

∴原式=6-(class="stub"1
6
+class="stub"1
24
+class="stub"1
60
+class="stub"1
84
+class="stub"1
120
+class="stub"1
210

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

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

=6-class="stub"1
4

=class="stub"23
4

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