Ответ:
a1=
[tex]5 \times 1 + \frac{7}{3} = \frac{22}{3} [/tex]
a4=
[tex]5 \times 4 + \frac{7}{3} = \frac{67}{3} [/tex]
S4=
[tex] \frac{ \frac{22}{3} + \frac{67}{3} }{2} \times 4 = \frac{178}{2} = 89[/tex]
ответ:89
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Ответ:
a1=
[tex]5 \times 1 + \frac{7}{3} = \frac{22}{3} [/tex]
a4=
[tex]5 \times 4 + \frac{7}{3} = \frac{67}{3} [/tex]
S4=
[tex] \frac{ \frac{22}{3} + \frac{67}{3} }{2} \times 4 = \frac{178}{2} = 89[/tex]
ответ:89