负三分之一的1999次方乘3的1999次方:等于负1
再乘以3,等于负3
所以答案是:-3
猜你喜欢
- 1如何计算流量.压力是0.8MPa压缩空气,空气流速取20米/秒,管道为DN25,流量是每小时多少立方?
- 2If these shoes are too big,ask him to bring you a small ( ) A.one B suit C.pair D.ones
- 31*2/1+2*3/1+3*4/1+.+2004*2005/1=
- 4如图,过圆外一点作圆O的两条割线PAB,PCD,求证PA*PB=PC*PD
- 5you must hand__your work__time he sits __Tom and Mary at the same table 用介词
- 6一种计算计包装箱,标明的尺寸(单位mm)是380*266*530.它的体积多少立方分米
- 7Would you please help me with this heavy box?
- 8帮我写英语作文,
- 9用400粒大豆做发芽试验,有12粒未发芽,发芽率是多少.
- 10一道关于摩擦力的物理题