（3√12 - 2√1/3 +√48）÷2√3+√18 -2/√2 +|1-√2| +（1/2）负的1平方
=(6√3-2/3√3+4√3)÷2√3+3√2-√2+√2-1+2
=5-1/3+3√2+1
=(17/3)+3√2已知a=2+√3 b=2-√3求（a+√ab/√ab +b）+（√ab -b/a-√ab）a=2+√3b=2-√3则：ab=4-3=1所以：（a+√ab/√ab +b）+（√ab -b/a-√ab）=(2+√3+1)/(1+2-√3)+(1-2+√3)/(2+√3-1)=(3+√3)/(3-√3)+(√3-1)/(√3+1)=(3+√3)²/(9-3)+(√3-1)²/(3-1)=2+√3+2-√3=2+2=4