1) 9.25+9.25=18.5
2) 26.7-18.5=8.2
3) 8.2+8.2+26.7=43.1
4) 85.85-43.1=42м75см
Х1-х2=189
х1:х2=10
Решаешь систему уравнений.
Lim (x->-4) (scrt(x+12)-sqrt(4-x))/(x^2+2x-8)=lim (x->-4) (x+12-4+x)/((scrt(x+12)+sqrt(4-x))(x^2+2x-8))=lim (x->-4) (2x+8)/((scrt(x+12)+sqrt(4-x))(x+4)(x-2))=lim (x->-4) (2(x+4))/((scrt(x+12)+sqrt(4-x))((x+4)(x-2))=lim (x->-4) (2)/((scrt(x+12)+sqrt(4-x))(х-2))=2/((scrt(8)+sqrt(8))(-6))=2/((-24scrt(2))=-1/12scrt(2)=-scrt(2)/24
Ctg(7arcctg(-√3)+25π/4)=Ctg(7(5π/6)+6π+π/4)=Ctg(35π/6+π/4)=
=Ctg(6π-π/6+π/4)=Ctg(-2π/12+3π/12)=Ctg(π/12)=cos(π/12)/sin(π/12)=
=2cos²(π/12)/[2cos(π/12)sin(π/12)]=(1+cos(π/6))/(sin(π/6)=
=(1+√3/2)/(1/2)=2+√3