解:建立坐标系(如图) F=-FcoSal c 1 F 2 5 1+x m ON w=F dx=-rrFrdx 1+x 1.732m e30 々370=1327m W=F(1+xI +x2)=169J8 解: 建立坐标系(如图) Fx = −F cos d x x x W d x F x x x  x Fx  + = = − 2 1 2 1 2 1 2 1 x x F + = − ( 1 1 ) 2 2 2  W = F + x1 − + x = 1.69J m tg x 1.732 30 1 1 0 = = m tg x 1.327 37 1 2 0 = = 1 5 m N  x 0 F