Question

2) resolva as equações do 1° grau:
Nível 2
a)3x+5=20
b)9x-2=16
c)2x+15=45
d)10x-18=22
e)x:4+6=9
f)x:7-4=2​

Answer 1

Resposta:

a) 3x+5=20

3x=20-5

3x=15

x=$\frac{15}{3\\}$

x=5

b) 9x-2=16

9x=16+2

9x=18

x=$\frac{18}{9}$

x= 9

c) 2x+15=45

2x=45-15

2x=30

x=$\frac{30}{2}$

x=15

d) 10x-18=22

10x=22+18

10x=40

x=$\frac{40}{10}$

x=4

e) x:4+6=9

x:10=9

x=9×10

x=90

f) x:7-4=2

x:3=2

x=2×3

x=6