121x3/4-3/8x40-0.75(1/8+1/24+1/48+1/80+1/120+1/168)x56(7-11/16x3)+(1-11/16x7)+(5-11/16)+(3-11/16x5)
问题描述:
121x3/4-3/8x40-0.75
(1/8+1/24+1/48+1/80+1/120+1/168)x56
(7-11/16x3)+(1-11/16x7)+(5-11/16)+(3-11/16x5)
答