(√20+√5)/√5 - 2
=√20/√5 +√5/√5 - 2
=√(20/√5) + 1 - 2
= √4-1
= 2-1
= 1
√12/√3 + √27
= √(12/3) + √(9*3)
= √4 + 3√3
= 2+3√3不是,第二道是5哇 ?(√12 + √27)/√3= √(12/3) + √(27/3)= √4 + √9= 2+3= 5再问问2道。可以么。先采纳再问吧,, 回答就会采纳滴、1.根号7分之1+根号28-根号700=?,2.根号32-3根号2分之1+根号2=?(1+√28-√700)/√7 = 1/√7 + √(28/7) - √(700/7) = √7/7+√4-√100= √7/7+2-10=√7/7-8=(-56+√7)/7(1+√2) / (√32-3√2) = (1+√2) / (4√2-3√2)=(1+√2) / √2 = (√2+2)/2