4√18-（98-2√75+3√27)
=12√2-(98-10√3+9√3)
=12√2-(98-√3)
=12√2-98+√3
4√18-（9√8-2√75+3√27) 括号里的是9√8吗
=12√2-(18√2-10√3+9√3)
=12√2-(18√2-√3)
=12√2-18√2+√3
=-6√2+√3√x²= √3x-2＝ 1/√-1= ³√x-2= √x²+1= x+1/√x-2= √x+1/x-2= √-1/a=请先采纳,谢谢