原式=3√2+4√2-5√2(4-3)+(2√3+1)²=7√2-5√2+12+1+4√3=2√2+4√3+13
原式=3根号2+4根号2-5根号2(4-3)+4根号3+2 =根号2+4根号3+2
原式=3根号2+4根号2-5根号2(2+根号3)(2-根号3)=3根号2+4根号2-5根号2(4-3)=3根号2+4根号2-5根号2=2根号2