Odpowiedź:
a) -6
b) 1⅖
c) 4
d) 0.1
e) 4
f)
[tex] \frac{1}{11} [/tex]
Szczegółowe wyjaśnienie:
a) 3x + 5 = -13 //– 5
3x = -13 – 5
3x = -18
x = -6
b) 7x – 2 = 2x + 5 //– 2x
7x – 2 – 2x = 5 //– 2
7x – 2x = 5 + 2
5x = 7 //÷ 5
x = 7/5 = 1⅖
c) 2(x + 3) = x +10
2x + 6 = x + 10 //– 6
2x = x + 10 – 6 //– x
2x – x = 10 – 6
x = 4
d) 5x = ½
5x = 0.5 //÷5
x = 0.1
e) x/3 – ⅓ = 1 //• 3
x – 1 = 3 //+ 1
x = 3 + 1
f) 2x + 3 /5 = 2 – x /3 //• 15
6x + 9 = 10 – 5x //+ 5x
6x + 9 + 5x = 10 //– 9
6x + 5x = 10 – 9
11x = 1 //÷11
x = 1/11
