Question

Am nevoie de rezolvare urgent

Answer 1

Explicație pas cu pas:

14.

$r = 18 - 15 = 3$

$a_{2} + r = 15 \iff a_{2} = 15 - 3 = 12$

$a_{1} + r = a_{2} \iff a_{1} = 12 - 3 = 9$

15.

$6 \cdot q^{2} = 96 \iff q^{2} = 16 \implies q = 4$

$b_{1} \cdot q = 6 \iff b_{1} \cdot 4 = 6$

$b_{1} = \dfrac{6}{4} \implies b_{1} = \dfrac{3}{2}$