八分之五乘四分之一加四分之一除以三分之八加零点二五
=5/8x1/4+1/4x3/8+1/4
=1/4x(5/8+3/8+1)
=1/4x2
=1/21/8*25％÷1/8*25％1/8*25％÷1/8*25％=1两边都是一样的相除等于1