<span>(2+√3)(1-√3)=2-√3+√3-(√3)²=2-3=-1
</span><span>√27+√48-√75=√75-√75=0</span>
(a-b)²-2b²+2a²=a²-2ab+b²-2b²+2a²=
=3a²-2ab-b²
a) (a-b)(3a+b)=3a²-2ab-b²
b)3(a-b)(2b-a)=6ab-a²-2b²
c) (a-b)(2a-b)=2a²-4ab+b²
d) (a-b)(4a+b)=4a²-3ab-b²
<span> - 1 = -4х
12x</span>²+4x-1=0
D=16+48=64
x12=(-4+-8)/24=-1/2 1/6
x=-1/2
x=1/6
<span>|2x-3<span>|=<span>|x+1<span>|</span></span></span></span>