1) х² -2х = х+2-х²х² - 2х - х +х² - 2 = 02х² - 3х - 2 =0D=(-3)² - 4*2*(-2) = 9+16 = 25 = 5²x1= (3 - 5)/(2*2) = -2/4 =-0.5x2 =(3+5)/4 = 8/4 = 22) 3х² -8х + 13 = (х-5)²3х² - 8х + 13 = х² - 10х + 253х² - 8х + 13 - х² + 10х - 25 =02х² +2х -12 = 0 |÷2x²+x - 6 =0D=1² - 4*1*(-6) = 1 +24 = 25 = 5²x1= (-1-5)/ (2*1) = -6/2 =-3x2= (-1+5)/2 = 4/2=23) (x+1)²=(x-2)²x²+2x+1 = x² -4x +4x² +2x + 1 - x² +4x - 4 =06x - 3 =06x= 3x=3/6 = 1/2x=0.54)(x-10)² = (1-x)²x²-20x +100 = 1 -2x+x²x² -20x +100 -1 +2x -x²=018x + 99 =0x=99/18 = 11/2x=5.55) условие можно прочитать по-разному:(x+x)/3 = 82x/3 =82x= 3*82x= 24x=24/2x=12или x + (x/3) = 8 |*33x +x = 8*34x=24x=24/4x= 66) x+1-5(x-5)(5-x)+5 = ??? условие не корректно.7) х/2 + х/4 = -3/2 | *42x +x = - 3/2 * 43x= - 6x=-6/3x=-28)(x/2) +(x/4) +x= -49/4 |*42x +x +4x = -497x=-49x= -49/7x=-79) 6 - (x/3) = х/7 | * (7*3)126 - 7x = 3x-7x-3x=-126-10x=-126x= (-126) / (-10)x= 12.610) (13+x)/3 - 3 =4x |*313+x - 9 = 12x4+x= 12x12x-x=411x=4x=4/1111) x-(x/3) = 1/2 |*66x - 2x = 34x=3x=3/4