问题 解答题
1-(
101010
202020
2×(
202020
303030
2×(
333033
555055
2×(
555555
777777
2=______.
答案

1-(

101010
202020
2×(
202020
303030
2×(
333033
555055
2×(
555555
777777
2

=1-(

10×10101
20×10101
2×(
20×10101
30×10101
2×(
111011×3
111011×5
2×(
111111×5
111111×7
2

=1-(

1
2
2×(
2
3
2×(
3
5
2×(
5
7
2

=1-

1
4
×
4
9
×
9
25
×
25
49

=1-

1
49

=

48
49

故答案为:

48
49

问答题 论述题
判断题