Question

1) Resolva as equações


a)2+a=5a

b)3+m=2m

c)3+2p=2-4p

d)2a-2=a+2

e)3a-5a=7a+15

f)4m+2m=m+15

Answer 1

Resposta:

a)

$2 + a = 5a \\ 5a - a = 2 \\ 4a = 2 \\ a = \frac{2}{4} \\ a = \frac{1}{2}$

b)

$3 + m = 2m \\ 2m - m = 3 \\ m = 3$

c)

$3 + 2p = 2 - 4p \\ 2p + 4p = 2 - 3 \\ 6p = - 1 \\ p = - \frac{1}{6}$

d)

$2a - 2 = a + 2 \\ 2a - a = 2 + 2 \\ a = 4$

e)

$3a - 5a = 7a + 15 \\ - 2a - 7a = 15 \\ - 9a = 15 \\ - a = \frac{15}{9} \\ - a = \frac{5}{3} \\ a = \frac{5}{3}$

f)

$4m + 2m = m + 15 \\ 6m - m = 15 \\ 5m = 15 \\ m = 15 \div 5 \\ m = 3$