Решите уравнения. 1) y²+18y+81=0 2) 4y²+4y+1=0 3) -2x²+5x+3=0 4) 3x²-8x+5=0
1) y^2+18y+81=0 (y+9)^2=0 y^2+18y+81=0 (y+9)^2=0 y+9=0y=-9 2) 4y^2+4y+1=0 (2y+1)^2=0 4y^2+4y+1=0 (2y+1)^2=0 2y+1=0 y=-1/2 3) -2x^2+5x+3=0 3x+3=0 3x=-3 x=-1 4) Хз