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Ответ:1) 3x^2-5x+6=0

x^2=2x-3x+6=0

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

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

x-2=0

x-3=0

x1=2;x2=3

3) 3x^2+5x+2=0

3x^2+3x+2x+2=0

3x(x+1) +2(x+1) =0

(x+1) (3x+2) =0

x+1=0

3x+2=0

x1=-1 x2=-2/3

5) x^2+10x-9x-90=0

x(x+10) -9(x+10) =0

(x+10) (x-9) =0

x+10=0

x-9=0

x1=-10 x2=9

2) 2x^2+6x-x-3=0

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

(x+3) (2x-1) =0

x+3=0

2x-1=0

x1=-3 x2=1/2

4) (x+5) ^2=0

x+5=0

x=-5

6) x2+3x-12x-24=0

c(x+2) -12(x+2) =0

(x+2) (x-12) =0

x+2=0

x-12=0

x1=-2 x2=12

Объяснение: