两道化简题.....急
问题描述：
两道化简题.....急
1.2-根号5/2+根号5 2.1/三倍根号2-1
答
解1题：原式=(2-√5)/(2+√5)=(2-√5)²/[(2-√5)(2+√5)]=(4-4√5+5)/(2²-√5²)=(9-4√5)/(4-5)=(9-4√5)/(-1)=4√5-9 解2题：原式=1/(3√2-1)=(3√2+1)/[(3√2+1)(3√2-1)]=(3√2+1)/[(3√2)²-...