设z=z(x,y)是由方程x2+2y2+xy+z2=0所确定的隐函数,求全微分dz.
参考答案:
设
则
因此
匀质细杆AB长为L,重力的大小为P,与铅垂轴固结成角α=30°,并以匀角速度ω转动,则惯性力系的合力大小等于()。
A.√3L2Pω2/8g
B.L2Pω2/2g
C.LPω2/2g
D.LPω2/4g
The proverb "Life is but a walking shadow. " is derived from ().
A. Christianity and the Bible
B. great English literary works
C. Shakespeare’s works
D. English tradition and system