Объяснение:
a1=1.3; d=-0.2;
a1=1.3;
a2=a1+(n-1)d=1.3+1*(-0.2)=1.3-0.2=1.1;
a3=1.3+2*(-0.2)=1.3-0.4=0.9;
a4=1.3+3*(-0.2)=1.3-0.6=0.7;
a5=1.3+4*(-0.2)=1.3-0.8=0.5;
a6=1.3+5*(-0.2)=1.3-1=0.3.
