Question

计算下面的题,(1).√40-2√0.1+√90 (2).2√20+2/5√125+10√0.05-6√5 (3).(√

Answer 1

（1）=2√10-√10/5+3√10=(24√10)/5

(2)=4√5+2√5/125+√5-6√5=(123√5)/125

(3)=(√2+√3)(2√2-2√3)=-2

(4)=7(3+√2)/[(3-√2)(3+√2)]=7(3+√2)/(9-2)=3+√2