2) Determine o valor de x nas equações:
a) x – 3 = 12 e) 2x – x + 5 = 18
b) x – 5 = 9 f) 32 + x = 52
c) x + 8 = 10 g) 24 = x - 14
d) x + 15 = 45 h) x + 9 = 0
3) Determine o valor de x nas equações:
a) 2x – 8 = 20 d) 4x – 10 = 2x + 2
b) 6x = 2x + 16 e) 5x + 7 = 4x + 10
c) 2x – 5 = x + 1
Soluções para a tarefa
Resposta:
2)
a) x-3=12 b) x-5=9 c) x+8=10 d) x+15=45 e) 2 x-x+5=18
x=12+3 x=9-5 x=10-8 x=45-15 2x-x=18-5
x=15 x=4 x=2 x=30 x=13
f) 32+x=52 g) 24=x-14 h) x+9=0
x=52-32 24+14=x x=0+9
x=20 x=38 x=9
3)
a) 2x-8=20 b) 6x=2x+16 c) 2x-5=x+1 d) 4x-10=2x+2
2x=20-8 -2x+6x=16 -1-5=x-2x -2-10=2x-4x
2x=12 4x=16 -6=-x ×(-1) -12=-2x ×(-1)
x=12/2=6 x=16/4=4 x=6 2x=12
x=12/2=6
e) 5x+7=4x+10
-4x+5x=10-7
x=3