Odpowiedź :
Odpowiedź:
[tex]a) \: 0.05x + 0.17x = 4.4 \\ 0.22x = 4.4 \\ x = 4.4 \div 0.22 \\ x = 20 \\ b) \: 5x - 9 = 26 \\ 5x = 26 + 9 \\ 5x = 35 \\ x = 35 \div 5 \\ x = 7[/tex]
[tex]c) \: 4 + 2(x - 1) = 6 \\ 4 + 2x - 2 = 6 \\ 2 + 2x = 6 \\ 2x = 6 - 2 \\ 2x = 4 \\ x = 4 \div 2 \\ x = 2 \\ d) \: 4x - 24 = - 3x + 4 \\ 4x + 3x = 4 + 24 \\ 7x = 28 \\ x = 28 \div 7 \\ x = 4[/tex]
[tex]e) \: 5x + 7 = 4x + 7 \\ 5x - 4 x = 7 - 7 \\ x = 0[/tex]
[tex]f) \: 3(x - 2) + x = x - 3 \\ 3x - 6 + x = x - 3 \\ 4x - 6 = x - 3 \\ 4x - x = - 3 + 6 \\ 3x = 3 \\ x = 3 \div 3 \\ x = 1 = odp. \: C[/tex]
Szczegółowe wyjaśnienie:
Zadanie 1
a) 0,05x + 0,17x = 4,4
0,22x = 4,4 /: 0,22
x = 20
b) 5x - 9 = 26
5x = 26 + 9
5x = 35 /: 5
x = 7
c) 4 + 2(x - 1) = 6
4 + 2x - 2 = 6
2x = 6 - 4 + 2
2x = 4 /: 2
x = 2
d) 4x - 24 = -3x + 4
4x + 3x = 4 + 24
7x = 28 /: 7
x = 4
e) 5x + 7 = 4x + 7
5x - 4x = 7 - 7
x = 0
Zadanie 2
3(x - 2) + x = x - 3
3x - 6 + x = x - 3
3x + x - x = -3 + 6
3x = 3 /: 3
x = 1
A więc odp C
Pozdrawiam.