125??1000 =2;8 =2500?(125x 8) =2500?
125先乘以8
125*8=10003000/(125*8)=3000/1000=3
3000÷125÷8=3000÷(125x8)=3000÷1000=3
3000÷125÷8=2500÷(125x 8) =2500