1.х+3=5-хх+х=5-32х=2х=13.х+11=(х-1)^2х+11=х^2-2х+1х^2-2х+1-х-11=0х^2-3х-10=0д=9-4×(-10)=49х1=(3-7)/2=-2х2=(3+7)/2=52.1-х=(х+1)^21-х=х^2+2х+1х^2+2х+1-1+х=0х^2+3х=0х(х+3)=0х1=0х+3=0х2=-34.х^2+х+4=16х^2+х+4-16=0х^2+х-12=0д=1-4×(-12)=49х1=(-1-7)/2=-4х2=(-1+7)/2=36.5-х-2V(5-x)(5+x) +5+х=410-2V(25-x^2)=42V(25-x^2)=6V(25-x^2)=325-x^2=9х^2=25-9х^2=16х1=4х2=-45.2х+1-2Vx(2x+1) +x=13x+1-2V(2x^2+x)=12V(2x^2+x)=3x4(2х^2+х)=9х^28х^2+4х=9х^29х^2-8х^2-4х=0х^2-4х=0х(х-4)=0х1=0х-4=0х2=411.х^3-7=1х^3=8х=2