Question

Me ajudem por favor ! (Com Resolução)

Answer 1

$a) para\to a= \frac{1}{3} ~e~b= -\frac{1}{5} \\\\ a+b\to \frac{1}{3}+( -\frac{1}{5})\to mmc=15\to \frac{5+(-3)}{15}\to \frac{5-3}{15}\to \frac{2}{15} \\\\\\\\ b)\ para\to x=7~e~ y=- \frac{1}{2} \\\\ 2x-y\to 2*7-(- \frac{1}{2})\to 14+\frac{1}{2}\to mmc=2\to \frac{28+1}{2}\to \frac{29}{2}$




$c)\ para\to x= \frac{1}{2} ;\ y= \frac{1}{3} ~e~z= \frac{1}{4} \\ \\ x^{2} -yz\to (\frac{1}{2})^2-\frac{1}{3}*\frac{1}{4}\to \frac{1}{4}-\frac{1}{12}\to mmc=12\to \frac{3-1}{12}\to \frac{2}{12}\to \frac{1}{6}$