Question

calcule o valor numérico das expressões:
a) X-Y
b) 3x+A
c) 2x+M
d) M-2a
e) X+Y
f) A-B​

Answer 1

Resposta:

a) X-Y

$5-(-4)\\5+4\\=9$

b) 3x+A

$3.2+6\\6+6\\=12$

c) 2x+M

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

d) M-2a

$3-2.(-5)\\3+10\\=13$

e) X+Y

$\frac{1}{2} +(-\frac{1}{5}) \\\\\frac{1}{2}-\frac{1}{5} \\\\\frac{5-2}{10} \\\\=\frac{3}{10}$

f) A-B​

$3-(-\frac{1}{2})\\\\3+\frac{1}{2}\\\\\frac{6+1}{2} \\\\=\frac{7}{2}$