Question

Inscrevendo-se seis meios aritméticos aritméticos entre 7 e 42, qual e o exato termo da p.a.?



URGENTE

Answer 1

$\large\boxed{\begin{array}{l}\sf (7,\blacktriangle,\blacktriangle,\blacktriangle,\blackstriangle\blacktriangle,\blacktriangle,\blacktriangle,42).\\\sf a_1=7\\\sf a_8=42\\\sf a_8=a_1+7r\\\sf 42=7+7r\\\sf 7r=42-7\\\sf 7r=35\\\sf r=\dfrac{35}{7}\\\\\sf r=5\\\sf A\,PA\,formada\,ser\acute a~(7,\boldsymbol{12,17,22,27,32,37},42)\end{array}}$