99+99×99+99×99×99=______.
0.87×99+0.87=______×______.
97+98+99+100+101+102+103=______×______=______.
简便计算:101×99=______.
三个连续奇数的和99,这三个奇数分别是______,______,______.
99+99×99+99×99×99=______.
99+11×19+11×80______.
简算:9999+999+99+9=______.
9+99+999+9999+99999+999999=______.
计算:99999+9999+999+99+9=______.
1+3+5+…+99=______.
13×99+135×999+1357×9999=______.
观察并完成序列:1、9、19、33、51、______、99、______.