Question

A)20×+4-6×=5×+11
B)4(-×)=6(×+4)
C)25×14=30×+16
D)3,6×+2,8+1,4×4,2×+7,2
E)60-50×-36=-40×+10
F)5,6+3,4×-12,8=4×+5
G)100×+75=50×-25

Answer 1

Equação do 1 Grau.

A) 20x+4-6x=5x+11
20x-6x-5x=11-4
20x-11x=7
9x=7
x=7/9
x= 0,777... S= {0,777}

B) 4.(-x)=6.(x+4)
-4x=6x+24
-6x-4x=24
-10x=24
-x=24/10
-x=2,4 .(-1)
x=-2,4 S={-2,4}

C) 25x+14=30x+16
25x-30=16-14
-5x=2
-x=2/5
-x=0,4 .(-1)
x=-0,4 S={-0,4}

D) Não sei porque falta a igualdade.

E) 60-50x-36=40x+10
-50x-40x=10+36-60
-90x=-14
-x=-14/90
-x=0,155... .(-1)
x=0,155... S={0,155...}

F) 5,6+3,4x-12,8=4x+5
3,4x-4x=12,8+5-5,6
-0,6x=12,2
-x=12,2/0,6
-x=20,0333... .(-1)
x=-20,0333... S={20,0333...}

G) 100x+75=50x-25
100x-50x=-25-75
50x=-100
x=-100/50
x=-2 S={-2}