1.(x+3)(x-4)=-12x^2+3x-4x-12=-12x^2-x=0x=0 или x-1=0 x=1 2.18-(x-5)(x-4)=-218-(x^2-5x-4x+20)=-218-x^2+9x-18=0-x^2+9x=0x=0 или -x+9=0 x=93.(3x-1)²=19x^2-6x+1=19x^2-6x=03x=0 или 3x-2=0 x=2/34.5x+(2x+1)(x-3)=05x+(2x^2+x-6x-3)=02x^2-3=0x^2=3/25.(2x+3)(3x+1)=11x+306x^2+9x+2x+3-11x-30=06x^2-27=0x^2=27/6x^2=9/2( +-3/корень из 2)6.x²-5=(x-5)(2x-1)x^2-5=2x^2-10x-x+5x^2-11x+10=0D=121-40=81x1=(11-9)/2=1x2=(11+9)/2=10