√а+√b-(√a-√4b)2 / √a-2<span>√b
</span>√а+√b-(√a-√2b)
√а+√b-√a+√2b
√b+√2b
3√b
3√1/16=3/4
X^4-5x^2+4=0
x^2=t
t^2-5t+4=0
t1=1
t2=4
t1=1 => x^2=1 => x=+1;-1
t2=4 => x^2=4 => x=+2;-2
(2m-3n)(5m+n)-10(m+n)*2=
10m*2+2mn-15mn-3n*2-10(m*2+2mn+n*2)=
10m*2+2mn-15mn-3n*2-10m*2-20mn-10n*2=
-33mn-13n*2
*2 значит во 2степени