计算(1)(根号12-3根号75)×2根号3(2)(根号48+3根号15)÷根号3(3)(4+根号7)(4-根号7)
问题描述:
计算(1)(根号12-3根号75)×2根号3(2)(根号48+3根号15)÷根号3(3)(4+根号7)(4-根号7)
答
(1))(根号12-3根号75)×2根号3 =(2根号3-15根号3)x2根号3 =-12根号3x2根号3 =-72(2)(根号48+3根号15) ÷根号3 =(4根号3+3根号15)÷根号3 =4+3根号5(4+根号7)(4-根号7) =4^2-7 ...