(-125又5/7)÷（-5）=(-125又5/7)*（-1/5）=-125*（-1/5）+5/7*（-1/5）=25-1/7=24又6/7[47-(18.75-1÷15/8)×2又25/6]÷0.46 =[47-(75/4-15/8)×56/25]x50/23=[47-(75/4×56/25-15/8x56/25)]x50/23=[47-42+21/5]x50...