1)x^2+9x+14=0
2)x^2-2,6х-20,4=0
3)x^2-10x/3+8/3=0
4)x^2-5x-24=0
5)x^2-8x/7+16/49=0
6)x^2-8x/7+16/49=0
7)x^2-(V2+V5)x+V10=0
8)x^2-6x+4=0
9)x^2-(V2-V7)x-V14=0
<span>1)(х - 2,5)^2 =49</span>
cos(2)t+sin(2)t=1