试题与答案

计算:7116×67+6115×56+5114×45+4113×34+3112×

题型:填空题

题目:

计算:71
1
6
×
6
7
+61
1
5
×
5
6
+51
1
4
×
4
5
+41
1
3
×
3
4
+31
1
2
×
2
3
=______.

答案:

71

1
6
×
6
7
+61
1
5
×
5
6
+51
1
4
×
4
5
+41
1
3
×
3
4
+31
1
2
×
2
3

=(70+

7
6
6
7
+(60+
6
5
5
6
+(50+
5
4
4
5
+(40+
4
3
3
4
+(30+
3
2
2
3

=60+1+50+1+40+1+30+1+20+1,

=205.

故答案为:205.

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