Х2+14х+12>0
Х2+14х>-12
16х>-12
Х>-0.75
Х<0.75
X^2-2x+x+2-x^2= -x+2
<span>7x^2-4x-24+-x^2= 6х^2-4х-24
</span>7x^2-6x-11+-x^2-2x+13= 6х^2-8х+2
2x^2-8x+13+(x-5)^2= 2x^2-8x+13+х^2-10х+25= 3х^2-18х+38
<span>(x+1)^2+(x-2)^2= х^2+2х+1+х^2-4х+4= 2х^2-2х+5
</span><span>(x-10)^2+(1-x)^2= х^2-20х+100+1-2х+х^2= 2х^2-22х+101
</span>Вот так вот
2) ...=(2a-1)(2a+1)(4a^2+1)-6a^4=(4a2+2a-2a-1)(4a^2+1)-6a^4=16a^4+4a^2-4a^2-1-6a^4=10a^4-1
<span>7/20= 0.35 вот обьяснения и всё</span>