Question

calcule a soma dos 5 primeiros termos da pa (1,3,5​

Answer 1

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$\sf{a_5=a_3+2r}\\\sf{a_5=5+2\cdot2}\\\sf{a_5=5+4}\\\sf{a_5=9}\\\sf{S_5=\dfrac{5(1+9)}{2}}\\\sf{S_5=\dfrac{5\cdot\diagdown\!\!\!\!\!\!\!10^5}{\diagdown\!\!\!\!2}}\\\huge\boxed{\boxed{\boxed{\boxed{\sf{S_5=5\cdot5=25}}}}}$