【1-(1/5+2/3)*4/13】/ 11/20 =(1-13/15x4/13)x20/11 =(1-4/15)x20/11 =11/15x20/11 =4/3 (1/8+1/6)/5/24-2/3*1/4 =7/24x24/5-1/6 =7/5-1/6 =42/30-5/30 =37/30 互相帮助,祝新年快乐!