me ajudem por favor,coloquem o cálculo conto com base obgdoo
resolva as equações do 1° grau:
Soluções para a tarefa
Resposta:
A) x=0
B) x=-4
C) x=-7
D)x=5
E)x=-5
F)x=3
G)x=5
H)x=-251/71
Explicação passo-a-passo:
A)2×+4(x+15)=120
2×+4(x+15)=120
8(x+15)=120
8(x+15)÷8=120÷8
x+15=12÷8
8(x+15)÷8=120÷8
x+15=15
8(x+15)=120
x+15=15
x=0
Resposta
x=0
B)5×+12=-8
5x+12=-8
5x+12-12=-8-12
5x=-8-12
5x+12=-8
5x=-8-12
-8-12
-(8+12)
-20
5x=-8-12
5x=-20
5x÷5=-20÷5
x=-20÷5
5x÷5=-20÷5
x=-4
5x=-20
x=-4
Resposta
x=-4
C)3(x+8)=3
3(x+8)=3
3(x+8)÷3=3÷3
x+8=3÷3
3(x+8)÷3=3÷3
x+8=1
3(x+8)=3
x+8=1
x+8-8=1-8
x=1-8
x+8=1
x=1-8
1-8
-(8-1)
-7
x=-1-8
x=-7
Resposta
x=-7
D) 6x-40=-10
6x-40=-10
6x-40+40=-10+40
6x=-10+40
6x-40=-10
6x-10+40
-10+40
+(40-10)
30
6x=-10+40
6x=30
6x÷6=30÷6
x=30÷6
6x÷6=30÷6
x=5
6x=30
x=5
Resposta
x=5
E)10+4(-x+10)=70
10+4(-x+10)=70
4(-x+10)
-4x+4×10
-4×+40
10+4(-x+10)=70
10-4x+40=70
50-4x=70
50-4x-50=70-50
-4x=70-50
50-4x=70
-4x=70-50
-4x=20
-4x÷(-4)=20÷(-4)
x=20÷(-4)
-4x÷(-4)=20÷(-4)
x=-20÷4
-4x÷(-4)=20÷(-4)
x=-5
-4x=20
x=-5
Resposta
x=-5
F) 3x+2-20=-5
3x+2-20=-5
3x+2x=-5
3x+2x
(3+2)x
5x
3x+2x-20=-5
5x-20=-5
5x-20+20=-5+20
5x=-5+20
5x-20=-5
5x=-5+20
-5+20
+(20-5)
15
5x=-5+20
5x=15
5x÷5=15÷5
x=15÷5
5x÷5=15÷5
x=3
5x=15
x=3
Resposta
x=3
G) 3(2×-9)+15=18
3(2×-9)+15=18
3(2x-9)
3×2x-3×9
6x-3×9
3×2x-3×9
6x-27
3(2x-9)+15=18
6x-27+15=18
-27+15
-(27-15)
-12
6x-27+15=18
6x-12=18
6x-12+12=18+12
6x=18+12
6x-12=18
6x=18+12
6x=30
6x÷6=30÷6
x=30÷6
6x÷6=30÷6
x=5
6x=30
x=5
Resposta
x=5
H)12×4(3×+11)-20=2×+6
12×4(3×+11)-20=2×+6
48)3x+11)-20=2x+6
48(3x+11)
48×3x+48×11
144x+48×11
48×3x+48×11
144x+528
48(3x+11)-20=2x+6
144x+528-20=2x+6
144x+508=2x+6
144x+508-2x=2x+6-2x
144x+508-2x=6
144x+508=2x+6
144x+508-2x=6
144x+508-2x-508=6-508
144x=2x=6-508
144x+508=2x+6
144x-2x=6-508
144x-2×
(144-2)x
142x
144x-2x=6-508
142x=6-508
144x-2x=6-508
6-508
-(508-6)
-502
144x-2x=6-508
142x=-502
142x÷142=-502÷142
x=-502+142
142x÷142=502÷142
x=-502/142
x=-502/142 aqui risque os dois numeros 502 e 142
x=-251/71
142x=-502
x=-251/71
Resposta
x=-251/71