Qual a resposta das equações?
a) x + 150 = 40
b) 50 – 20 + 2x = 80
c) 3x – 10 + 14 = -2x + 28
d) 20x – 30 = 40 + 30 - 20
e) -5x + 45 – 89 = -90 + 41
f) 10x – 20 = 40 + 50
g) 20 – 80 + 2x = 10
h) 19 + 2x – 13 = 10 - 20
Soluções para a tarefa
a. × + 150 = 40
×= 150-40
×= 110
b. 50-20+2×=80
2×=50-20+80
2×=30+80
×=110÷2
×=55
c. 3×-10+14=-2×+28
3×+2×=+10-14+28
5×= +10+14
5×=24
×=24÷5
×=4,8
d. 20×-30 =40+30-20
20×=40+30-20+30
20×=70-20+30
20×=50+30
20×=80
×=80÷20
×= 4
e. -5×+45-89=-90+41
f. 10×-20=40+50
10×=40+50+20
10×=110
×=110÷10
×= 11
g. 20-80+2×=10
2×=10-20-80
2×=-10-80
2×=+90
×=90÷2
×=45
h. 19+2×-13= 10-20
2×=10-20-19+13
2×=-10-19+13
2×= -29+13
2×= -16
×= -16÷2
×= -8
Oie, Td Bom?!
A)
x + 150 = 40
x = 40 - 150
x = - 110
B)
50 - 20 + 2x = 80
30 + 2x = 80
2x = 80 - 30
2x = 50
x = 50/2
x = 25
C)
3x - 10 + 14 = - 2x + 28
3x - 4 = - 2x + 28
3x + 2x = 28 + 4
5x = 24
x = 24/5 ou x = 4,8
D)
20x - 30 = 40 + 30 - 20
20x - 30 = 50
20x = 50 + 30
20x = 80
x = 80/20
x = 4
E)
- 5x + 45 - 89 = - 90 + 41
- 5x - 44 = - 49
- 5x = - 49 + 44
- 5x = - 5
x = - 5/-5
x = 5/5
x = 1
F)
10x - 20 = 40 + 50
10x - 20 = 90
10x = 90 + 20
10x = 110
x = 110/10
x = 11
G)
20 - 80 + 2x = 10
- 60 + 2x = 10
2x = 10 + 60
2x = 70
x = 70/2
x = 35
H)
19 + 2x - 13 = 10 - 20
6 + 2x = - 10
2x = - 10 - 6
2x = - 16
x = - 16/2
x = - 8
Ajudei?! Dúvidas?! É Só Chamar!