Предмет: Математика, автор: keksksusiisisk

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Автор ответа: nanoonan16th

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Пошаговое объяснение:

$a_n=a_1+(n-1)d$

$a_2=a_1+d\\0.7=-7+d\\-d=-7+0.7\\d=6.3$

$a_3=-7+2*6.3=5.6\\a_4=-7+3*6.3=11.9\\$

$S_4=\frac{(a_1+a_4)*4}{2} =(-7+11.9)*2=16.8\\$

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