Question

A) 6X-12y+3.(6y+3), para X=2 e y=1/2

B)4 .(a+2b) -15, para a=6 e b=5

Answer 1

$A) ~~~~6x-12y+3.(6y+3),~~ para ~~x=2 ~~e ~~y= \dfrac{1}{2} \\\\\\ 6*2-12* \dfrac{1}{2}+3*\left(6* \dfrac{1}{2}+3 \right)\to\\\\\\12- \dfrac{12}{2}+3*\left( \dfrac{6}{2}+3 \right)\to\\\\\\ 12- 6+3*\left( 3+3 \right)\to\\\\ 6+3*6\to\\\\ 6+18\to\\\\ \large\boxed{\boxed{24}}$






$B)~~~~4 *(a+2b) -15,~~ para~~ a=6 ~~e ~~b=5\\\\\\4*(6+2*5)-15\to\\\\ 4*(6+10)-15\to\\\\ 4*16-15\to\\\\ 64-15\to\\\\ \large\boxed{\boxed{49}}$