大家好，我是小环，我来为大家解答以上问题。八年级二次根式计算题50道，八年级二次根式计算题很多人还不知道，现在让我们一起来看看吧！

1、3/(8^0.5)-(4/(-3)*(27/(2^0.5))+3/(6^0.5)) =3/(2*(2^0.5))+(4/3)*(27/(2^0.5))-3/(6^0.5) =(3/2+(4/3)*(27)-3/(3^0.5))/(2^0.5) =(3/2+4*9-(3^0.5))/(2^0.5) =(75-2*(3^0.5))/(2*2^0.5) =75/(2*2^0.5)-(3/2)^0.5) 根号0.2m + m分之1根号5m^3 - m根号125分之m (0.2)^0.5*m+(5m^3)^0.5/m-m*(m/(125^0.5)) =(0.2)^0.5*m+(5m)^0.5-m^2/(5*5^0.5) =((0.2)^0.5*m*(5*5^0.5)+(5*5^0.5)*(5m)^0.5-m^2)/(5*5^0.5) =(5m+25*(m)^0.5-m^2)/(5*5^0.5) 6分之1根号5分之8 * （-5根号5分之18） (1/6)*(8/(5^0.5))*(-5*18/(5^0.5)) =(1/3)*(4/(5^0.5))*(-(5^0.5)*18) =-(4/3)*18 =-24 根号2x * 根号2y * 根号x (2x)^0.5*(2y)^0.5*(x^0.5) =(2x*2y*x)^0.5 =2x*(y^0.5) （根号mn - 根号n分之m）/根号n分之m (n大于0) ((mn)^0.5-m/(n^0.5))/(m/(n^0.5)) =((mn)^0.5-m/(n^0.5))*(n^0.5)/m =(n(m^0.5)-m)/(n^0.5)*(n^0.5)/m =(n(m^0.5)-m)/m =n/(m^0.5)-1。

本文到此讲解完毕了，希望对大家有帮助。