2x+y+y²-4x²=2x+y+(y-2x)(y+2x)=(y+2x)+(y-2x)(y+2x)=(y+2x)(1+y-2x)
A-b-c=2+2-8=-4
3*-1(-3+4)=-3*1= -3
Б) = 7x-5-8x+36 = -x+31
в) = 5x-15-6x+11 = -x-4
г) = x-7-6x+24 = -5x+17
д) = 12x+18-28x+80 = -16х+98
1.а. 75 б.3 в.1 2.а 3х^2-0.75=0 3x^2=0.75
x^2=0.25 x=0.5 б. 2-х^2+1=0 3-х^2=0 х^2=3
х= примерно 1.7 в.9+х^2-8=0 1+х^2=0 х^2=1 х=1
<span>5*(1/5)в квадрате-16*1/5=</span>1/5-16/5=3