1/125=(q^3)1/25 q^3= 0,2 q=0,5848
S= 1/25* (q^4-1)/q-1=0,085
10-4(2x+5)=6y-13
4y-63=5(4x-2y)+2
4y-63-20x+10y-2=0
14y-65-20x=0
x=0.7y-3.25
3-8x-6y=0
3-8*(0.7y-3.25)-6y=0
3-5.6y+26-6y=0
29-11.6y=0
y=29/11.6y=2.пятых
14*2.5-65-20x=0
-30-20x=0
x=-30/20
x=-1.5
1/125=(q^3)1/25 q^3= 0,2 q=0,5848
S= 1/25* (q^4-1)/q-1=0,085