Question

calcule o valor de cada expressao a seguir . a).2.x-x=2; b)x+30=40 c)30-20+2.x=10 d)18.x-43=65 e)23.x-16=14-17.x f)3.a-10+13=-2.a+28 g)10.y-5.(1+y)=3(2.y-2)-20

Answer 1

a) 2. x-x= 2
2x=2
x= 2/2
x=1

b) x+30=40
x=40-30
x=10

c) 30-20+2.x=10
10+2x=10
2x=10-10
2x=0
x= 0/2
x=0

d) 18.x-43=65
18x=65+43
18x=108
x=108/18
x=6

e) 23.x-16=14-17.x
23x-16=14-17x
23x+17x=16+14
40x= 30
x=30/40
x= 0,75

f) 3.a-10+13=-2.a+28
3a-10+13=-2a+28
3a+2a=28+10-13
5a= 25
a=25/5
a=5

g)10.y-5.(1+y)=3(2.y-2)-20
10y-5-5y=6y-6-20
10y-6y-5y=-6-20+5
-y= -21 (-1)
y=21

Espero ter ajudado ;)