Ответ:
a3= 27;
a4= 35.5
S4= 83
Объяснение:
a1=6; a2=14.5
d=14.5-6= 8.5
a3=a2+d; = 27
a4= a3+d; = 35.5
S4= 4(a1+a4/2)
S4= 4 (6+35.5/2) = 41.5/2 •4= 41.5•2= 83
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Ответ:
a3= 27;
a4= 35.5
S4= 83
Объяснение:
a1=6; a2=14.5
d=14.5-6= 8.5
a3=a2+d; = 27
a4= a3+d; = 35.5
S4= 4(a1+a4/2)
S4= 4 (6+35.5/2) = 41.5/2 •4= 41.5•2= 83