=99/(1+2+……+98)
=99/2/[98×(98+1)]
=98/(2/98×99)
=2/98
=49
猜你喜欢
- 1有理数ab在数轴上的位置如图所示,请判断(b-a)*(a+b)的符号,并说明理由
- 2朗诵着千古传诵的“送别诗”《别董大》中“莫愁前路无知已,天下谁能不识君”时,我又想起《 》中的 “ ,
- 3W＝2÷（12+1）＝0.1538
- 4数控机床的刀具选择翻译成英文怎么写啊
- 5Do you believe in love at first sight?Why or why not?
- 6实验室配置80mL0.5mol/L的Na2CO3溶液,根据计算,用托盘天平准确称量多少g固体Na2CO3.
- 7水平桌面上质量为1kg物体受到2N的水平拉力,产生1.5m/s^的加速度,若水平拉力增至4N,则物体获得多大加速
- 8英语翻译
- 9买不到啊
- 10I found () in the city of Beijing.A.works B.a work C.a piece of work