根号0.125 =√(1/8) =√(2/4) =√2/4 根号0.001乘3.2 √(0.001×3.2) =√(0.0001×32) =√(0.01×4×2) =0.01×4√2 =0.04√2 根号1又9分之7 =√(9分之16) =3分之4