Ответ:
d=a2-a1=-6-(-4)=-6+4=-2
S5=(a1+an) /2 *n= (-4-8)/2*5=-6*5=-30
a13=a1+(n-1)d=-4-24=-28
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Ответ:
d=a2-a1=-6-(-4)=-6+4=-2
S5=(a1+an) /2 *n= (-4-8)/2*5=-6*5=-30
a13=a1+(n-1)d=-4-24=-28