6x²-24x-5x+25+A=0
6x²-29x+25+A=0
A=-6x²+29x-25
О т в е т. -6х²+29х-25
21 : 53 = 220 : (y + 300)
y + 300 = 53 * 220 : 21
y + 300 = (555)5/21
y = (555)5/21 - 300
y = (255)5/21
5) 29 : 30 = 78 : (3y - 2)
3y - 2 = 78 * 30 : 29
3y - 2 = (80) 20/29
3y = (82) 20/29
y = (27)49 /87
X^2=20-x
x^2+x-20=0
D=1+80=81
x1=-1+9:2=4
x2=-1-9:2=-5
12:x=6
x=2
X+y xy (x+y)-xy (x+y)-xy
___ - ____ = ________ = ________ .
x-y x+y (x-y)(x+y) x^2-y^2