根号2＋根号3用分母有理化的方法
(√3+1/2)/(√2-1)=[(√3+1/2)(√2+1)]/[(√2-1)(√2+1)]=[(√3+1/2)(√2+1)]/[2-1]=(√3+1/2)(√2+1)=√6+√2/2+√3+1/2
