Question

resolva as seguintes equações do 1º:
a) 9x+12-x=100

b) 4x-8+5x=72

c) 7x-18-2x=12

d) 2x+6+x=x-8+4

e) x+7+3x=2x+5+20

f) 4x+6+x=2x+10+5

g) 5x-10+2x=x+10+40

Answer 1

a) 9x+12-x=100
9x+x=100-12
10x=88
x=88÷10
x=8.8

b) 4x-8+5x=72
4x-5x=72+8
-1x=80 ×(-1)
1x= -80
x= -80÷1
x=-80

c) 7x-18-2x= 12
7x-2x=12+18
5x=30
x=30÷5
x=6

D) 2x+ 6+ x=x-8+4
2x+x-x=-8+4-6
3x-x=-4-6
2x=-10
x=-10÷ 2
x=-5

E) x+7+3x=2x+5+20
x+3x-2x=5+20-7
4x-2x=25-7
2x=18
x=18÷2
x=9

F) 4x+6+x=2x+10+5
4x+x-2x=10+5-6
5x-2x=15-6
3x= 9
x=9÷3
x = 3

G) 5x-10+ 2x=x+10+40
5x+2x-x=10 + 40+ 10
7x-x=60
6x=60
x = 60÷6
x = 10


espero ter lhe ajudado

Answer 2

a) 9x+12-x=100

9x-x=100-12

8x=88

x=88:8

x=11

b) 4x-8+5x=72

4x+5x=72+8

9x=80

x=80:9

x=8,888

c) 7x-18-2x=12

7x-2x=12+18

5x=30

x=30:5

x=6