Question

determine a raiz de cada equação:

1)5x+18=-2+3
2)3+7.(x-4)=-(3x-10)
3)(3y:7)-(4:7)-(y:2)=5
4)3,5+12,3=2.(0,5x-0,5)

Answer 1

Vamos Lá:

1) 5x + 18 = -2+3
5x + 18 = `1
5x = 1-18
5x = -17

x = -17/5

2) 3+7*(x-4) = -(3x-10)
3 + 7x -28 = -3x + 10
7x + 3x = 10+28-3
10x = 35

x = 35/10 simplificando por 5

x = 7/2

3) (3y/7)-(4/7)-(y/2)= 5

M.M.C = 14

(6y/14)- (8/14)-(7y/14) = 70/14
6y-8-7y= 70
-y = 70+ 8
-y = 78 *(-1)

y = -78

4) 3,5 + 12,3 = 2(0,5x-0,5)
15,8 = x -1
-x = -15,8-1
-x = -16,8 *(-1)

x = 16,8

Bons Estudos!!!