Question

1- determine o 10° termo da PA (2,8,....).
2- calcule o sétimo termo da PA (1;6;11;....).

Answer 1

$> \: resolucao \\ \\ \geqslant \: progressao \: \: aritmetica \\ \\ 1 \: ) \: o \: 10 \: termo \: da \: pa \: (2.8....) \\ \\ r = a2 - a1 \\ r = 8 - 2 \\ r = 6 \\ \\ an = a1 + (n - 1)r \\ an = 2 + (10 - 1)6 \\ an = 2 + 9 \times 6 \\ an = 2 + 54 \\ an = 56 \\ \\ = = = = = = = = = = = = = = = = \\ \\ 2 \: ) \: o \: 7 \: termo \: da \: pa \: (1.6.11.....) \\ \\ r = a2 - a1 \\ r = 6 - 1 \\ r = 5 \\ \\ an = a1 + (n - 1)r \\ an = 1 + (7 - 1)5 \\ an = 1 + 6 \times 5 \\ an = 1 + 30 \\ an = 31 \\ \\ \\ \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \geqslant \geqslant$