a1=-9, a2=-0,9
d=-0,9-(-9)=8,1
a3=-0,9+8,1=7,2
а4=7,2+8,1=15,3
S4=a1+a4/2×4
S4=-9+15,3/2*4=6,3×2=12,6
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a1=-9, a2=-0,9
d=-0,9-(-9)=8,1
a3=-0,9+8,1=7,2
а4=7,2+8,1=15,3
S4=a1+a4/2×4
S4=-9+15,3/2*4=6,3×2=12,6