1+2+3+4+5.+199+200
=(1+200)×200÷2
=20100
猜你喜欢
- 1--four years since I joined the army.A.There was B.There is C.It was D.It is选个为什么请分析C和D
- 2因式分解:(1)2x^2-4x-3 (2)x^2-5x+5
- 3But___ any English books there.A there aren't.B doesn't have
- 4Do you have the key _______the door
- 5请在文中画出描写吉鸿昌神态的句子,说说你从中体会到了什么
- 6如图,两根铁棒直立于桶底水平的木桶中,在桶中加入水后,一根露出水面的长度是它的13,另一根露出水面的长度是它的15.两根铁棒长度之和为55cm,此时木桶中水的深度是( ) A.20cm B.
- 7一个质量为50千克的人,每只脚与地面接触面积为160厘米².
- 8写出三个你对"书籍"的认识的比喻句
- 9关于风花雪月的古诗.
- 10将句子中的错误用横线画出并改正