1：x个机轴 y个轴承 x+y=90 15x*2=24yx=40 y=502:设速度为x,y. 4/3(x+y)=800 (1) 40/3*(x-y)=800 (2) x+y=10(x-y) 9x=11y x=11y/9 y=270 x=330
