X^2 + 3x + 2 = 0
D = 9 - 8 = 1
x1 = ( - 3 + 1)/2 = - 1;
x2 = ( - 3 - 1)/2 = - 2;
x1 = - 1
y = 0
x2 = - 2
y = 0
А) 320 410 200 330 590 500
б) 900 600 400 900 600 1000
3) (m⁻⁴/(10n⁵k²))⁻² : (5m²n³k)³ = (10n⁵k²/m⁻⁴)² · (5m²n³k)⁻³
= 10² · n¹⁰k⁴m⁸ · 5⁻³ · m⁻⁶n⁻⁹k⁻³ = 100/125 · m⁽⁸⁻⁶⁾n⁽¹⁰⁻⁹⁾k⁽⁴⁻³⁾ = 4m²nk/5
4) (9c⁵/(a³b⁻²))⁻² : (a²b⁻³/(6c⁴))³ = (a³b⁻²/(9c⁵))² · (6c⁴/(a²b⁻³))³ =
= (a⁶b⁻⁹/(9²c¹⁰)) · (6³c¹²/(a⁶b⁻⁹)) = 1/81 · a⁶b⁻⁹c⁻¹⁰ · 216c¹²a⁻⁶b⁹ = 8/3 · a⁽⁶⁻⁶⁾b⁽⁹⁻⁹⁾c⁽¹²⁻¹⁰⁾ = 8c²/3
(b+3)^2=в^2+9+6в
25b^2+10b+1=(5в+1)^2
(2a-3b)(3b+2a)=4а^2-9в^2
b^2 - 4/9 =(в-2/3)(в+2/3)
1+b^3=1+3в+3в^2+в^3
(10-c)^2=100+с^2-200с
81a^2-18ab+b^2=(9а-в)