5.6÷1.25除以零点八除以二点五除以零点四=5.6÷(1.25x0.8)÷(2.5x0.4)=5.6÷1÷1=5.6
5.6÷1.25÷0.8÷2.5÷0.4=5.6÷(1.25×0.8)÷(2.5×0.4)=5.6÷1÷1=5.6