Question

Repede plsssss sa se calculeze b1 s10 b10 b20 daca q=2 b5=24 b4=12​

Answer 1

Răspuns:

Explicație pas cu pas:

q=2 b5=24 b4=12​  una din informat.ii e in plus, proabil ai rezolvat tu ceva

b1=b4/q³...12/8=3/2

b10=b4*q^6=12*64-..vezi tu

b20 =b4*q^16= 12*2^16=...

s10 =vedem

Answer 2

$\it \dfrac{..}{..}\ \ \ b_5=24;\ \ b_4=12\\ \\ \\ q=\dfrac{b_5}{b_4}=\dfrac{24}{12}=2\\ \\ \\ b_1=\dfrac{b_4}{q^3}=\dfrac{12}{2^3}=\dfrac{12^{(4}}{8}=\dfrac{3}{2}=1,5\\ \\ \\ b_{10}=b_5\cdot q^5=24\cdot2^5=24\cdot32=768\\ \\ \\ b_{20}=b_{10}\cdot q^{10}=768\cdot2^{10}=768\cdot1024=786432\\ \\ \\ S_{10}=b_1\cdot\dfrac{q^{10}-1}{q-1}=1,5\cdot\dfrac{2^{10}-1}{2-1}=1,5\cdot(1024-1)=1,5\cdot1023=1534,5$