Question

Expressões algébricas!! Me ajudem por favor.

Answer 1

Resposta:

tenho a mesma questao aaaaaaa

Explicação passo-a-passo:

Answer 2

Explicação passo-a-passo:

1) $x=5;y=4$

$x-y=5-4\\\\x-y=1$

2)$x=2;a=6$

$3x+a=3.2+6\\\\3x+a=6+6\\\\3x+a=12$

3)$x=-1;m=-3$

$2x+m=2.(-1)+(-3)\\\\2x+m=-2-3\\\\2x+m=-5$

4)$x=-4;y=8$

$x+y=-4+8\\\\x+y=4$

5)$x=\frac{1}{2} ;y=\frac{1}{5}$

$x+y=\frac{1}{2} +\frac{1}{5} \\\\x+y=\frac{5}{10} +\frac{2}{10} \\\\x+y=\frac{7}{10}$

6)$a=5;b=-\frac{1}{2}$

$a+b=5+(-\frac{1}{2} )\\\\a+b=5-\frac{1}{2} \\\\a+b=\frac{10}{2}-\frac{1}{2} \\\\a+b=\frac{9}{2}$

7)$a=1;b=-5;c=6$

$b^{2} -4ac=(-5)^{2} -4..1.6\\\\b^{2} -4ac=25-24\\\\b^{2} -4ac=1$