Question

a7=-3 , a32=70 : a1-? d-?​

Answer 1

Ответ: B) -23; 3.

Объяснение:

$\displaystyle\\\left \{ {{a_7=-5} \atop {a_{32}=70}} \right. \ \ \ \ \ \ \ \ \ \ \ \ -\left \{ {{a_1+6d=-5} \atop {a_1+31d=70}} \right.\ \ \ \ \ \ \\\\25d=75\ |:25\\\\d=3.\\\\a_1+6*3=-5\\\\a_1+18=-5\\\\a_1=-23.$