1) x³-49x=0
2) 7x²=(2x+1)²+3x²-5
3) (x-2)³+(x+2)³=2x(x²-1)+3
4) x³-3x²+2x-6=0
5) x³+2x²-9x-18=0
6) 7-(2x-2)*(4x+1)=2x*(5-4x)
7) (5-x)²-(3x-2)*(2x+1)=x*(2-5x)

1) x³-49x=0x(x²-49)=0x(x-7)(x+7)=0x₁=0x-7=0x₂=7x+7=0x₃=-72) 7x²=(2x+1)²+3x²-57x²=4x²+4x+1+3x²-57x²=7x²+4x-47x²+4x-4-7x²=04x-4=04x=4x=4:4x=13) (x-2)³+(x+2)³=2x(x²-1)+3(x-2+x+2)((x-2)²-(x-2)(x+2)+(x+2)²)=2x³-2x+32x(x²-4x+4-x²+4+x²+4x+4)=2x³-2x+32x(x²+12)=2x³-2x+32x³+24x=2x³-2x+32x³+24x-2x³+2x=326x=3x=26/34) x³-3x²+2x-6=0x²(x-3)+2(x-3)=0(x²+2)(x-3)=0x=35) x³+2x²-9x-18=0x²(x+2)-9(x+2)=0(x²-9)(x+2)=0(x-3)(x+3)(x+2)=0x-3=0x=3x+3=0x=-3x+2=0x=-26) 7-(2x-2)*(4x+1)=2x*(5-4x)7-(6x²-8x+2x-2)=10x-8x²7-(6x²-6x-2)=10x-8x²7-6x²+6x+2=10x-8x²-6x²+6x+9+8x²-10x=02x²-4x+9=0D=4*4-4*2*9=16-72=-56<0 корней нет7) (5-x)²-(3x-2)*(2x+1)=x*(2-5x)(25-10х+х²)-(6х²-4x+3x-2)=2x-5x²25-10x+x²-6x²+x+2=2x-5x²-5x²-9x+27=2x-5x²2x+9x=2711x=27x=27/11