А)
x^2 + 3x = 0
x (x + 3) = 0
x = 0; x = -3
б)
-x^2 + 8x = 0
x (-x + 8) = 0
x = 0; x = 8
в)
3x - x^2=0
x (3 - x) = 0
x = 0; x =3
г)
-7x + x^2 = 0
x (-7 + x) = 0
x = 0; x = 7
д)
19x - x^2 = 0
x (19 - x) = 0
x = 0; x = 19
е)
x^2 - 10x = 0
x (x - 10) = 0
x = 0; x = 10
Среднее арифметическое 67+82+64+62+82/5=71,4
1) y(2a+3b-3a+b)=y(4b-a)
2) (b-c)(a-c)
Cosx=-1/2
x=+-2Pi/3+2Pin, n∈Z
X^4-y^3*(2x)^2-2*3y²=x^4-3y²/y³*4x²=x^4 -3/4yx²