-0,5x²-x+4=0
Д=(-1)²-4*4*(-0.5)=1+8=9
x1=4
x2=-2
y = (1/2)*x² - x + 1.
1) y = (1/2)*0² - 0 + 1 = 1;
2) y = (1/2)*(-1)² - (-1) + 1 = 1/2 + 2 = 5/2;
3) y = (1/2)*(-2)² - (-2) + 1 = 2 + 2 + 1 = 5;
4) y = (1/2)*(4)² - 4 + 1 = 5.
<span>a)(5а-2b)-(-4а-3b)+2а=5а-2b+4a+3b+2a=(5a+4a+2a)+(-2b+3b)=11a+b
b)</span><span>3х*(х-2)-5х(х+3)=3x^2-6x-5x^2-15x=(3x^2-5x^2)+(-6x-15x)=-2x^2-21x</span>
3х - 7/8 - х-3/6 = 1
2х=(7×3)/24+(3×4)/24+24/24
2х=21/24+12/24+24/24
2Х=57/24
Х=57/(24*2)
Х=57/48