(2x + 3)² = 0
4x² + 2 · 2x · 3 + 9 = 0
4x² + 12 x + 9 = 0
D = b² - 4ac = 12² - 4 · 4 · 9 = 144 - 144 = 0
x = -b / 2a = -12 / 8 = -3/2 = -1,5
2/x = 2x^-1= -1*2x^-1-1 = -2x^-2 = -2/x²
A=2z² +11z
a² - 23a +126=0
D=23² - 4*126=529 - 504=25
a₁=(23-5)/2=9
a₂=(23+5)/2=14
При a=9
2z² +11z=9
2z² +11z-9=0
D=121+72=193
z₁=
z₂=
При а=14
2z²+11z=14
2z²+11z-14=0
D=121+112=233
z₁=
z₂=
Смотри решение во вложении
1)=45-150а+125а^-15а^-105а+21a+105a+49=
=94-159a+110a^
2)a^+2a+1+3a^-6a+3-5a^+5=-a^+9-4a
3)m^-2m+1-4m^-8m-4-6m^+6=-9m^-10m+3
4)5-10y+5y^-9-6y-y^-3+3y=-7-16y+7y
5)5-5m^-4+4m-m^-8+16m-m^=-7-7m^+20m