1)125×(17×8)×4 =125×8×4×17 =1000×68 =68000 2)25×16×125 =25×2×8×125 =50000 3)75000÷125÷15 =75×1000÷125÷15 =75÷15×1000÷125 =5×8 =40 4)150×40÷50 =150÷50×40 =3×40 =120 5)210÷42×6 =210÷7÷6×6 =30 6)375×480+6250×48 =480×(375+625) =480000 7)13×99 =13×(100-1) =1300-13 =1287 8)7900÷4÷25 =7900÷(4×25) =79 9)5600÷(25×7) =56×100÷25÷7 =56÷7×100÷25 =32 10)39600÷25 =396×100÷25 =396×4 =1584 本文来源：https://www.wddqw.com/doc/62afb802b4360b4c2e3f5727a5e9856a56122626.html