Решите уравнение а) (x-3) (x+3) - x (x-2) = 0

б) x^2 - (x-5) (x+5) = 3x

в) (x-2) (x+2) = 3 (x-4) ^2-2x (x+5)

(x-3) (x+3) - x (x-2) = 0

x ²-9-x²+2x=0

2x-9=0

x=9/2=4.5

x^2 - (x-5) (x+5) = 3x

x²-x²+25=3x

3x=25

x=25/3=8.3333333

(x-2) (x+2) = 3 (x-4) ^2-2x (x+5)

x²-4=3 * (x²-8x+16) - 2x²-10x

x²-4=3x²-24x+48 - 2x²-10x

x²-4-3x²+24x-48 + 2x²+10x=0

34x-52=0

x=52/34=1 целая (18/34)