Помогите решить..................................

1a)q=-6/4=-3/2a3=-6*(-3/2)=9a4=9*(-3/2)=-13,5a5=-13,5*(-3/2)=20,25b)q=2√6/2√2=√3a3=2√6*√3=2√18=2*3√2=6√2a4=6√2*√3=6√6a5=6√6*√3=6√18=6*3√2=18√22a18=a1+17d=5,6+17*0,6=5,6+10,2=15,83q²=b3/b1=80/5=16q=-4S5=b1(1-q^5)/(1-q)S5=5(1+1024)/(1+4)=5*1025/5=1025q=5S5=(1-1024)/(1-4)=5*1023/3=5*341=17054d=-14-(-12)=-14+12=-2B1a1=37,a=2;an=11337+2(n-1)=11329n-1)=113-372(n-1)=76n-1=76:2n-1=38n=38+1n=39a39=113S39=(a1+a39)*39/2=(37+113)*39/2=150*39/2=75*39=2925C1a1=-10a5=-810q^4=a5/a1=810/10=81q=-3-10;30;-90;270;-810q=3-10;-30;-90;-270;-810