2 równania - 12 pkt.
1) 5x - 6 = 9 + 2x
2) 2(x - 1) = 5
Z góry dziękuję :)
a) 5x-6=9+2x
5x-2x=9+6
3x=15
x=5
b) 2(x-1)=5
2x-2=5
2x=5+2
2x=7
x=3,5
1.
5x - 6 = 9 + 2x
5x - 2x = 9 + 6
3x = 15
x = 5
Sprawdzenie:
5 * 5 - 6 = 9 + 2 * 5
25 - 6 = 9 + 10
19 = 19
L = P
2.
2(x - 1) = 5
2x - 2 = 5
2x = 5 + 2
2x = 7
x = 3,5
2(3,5 - 1) = 5
7 - 2 = 5
5 = 5
Pozdrawiam ;-)
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a) 5x-6=9+2x
5x-2x=9+6
3x=15
x=5
b) 2(x-1)=5
2x-2=5
2x=5+2
2x=7
x=3,5
1.
5x - 6 = 9 + 2x
5x - 2x = 9 + 6
3x = 15
x = 5
Sprawdzenie:
5x - 6 = 9 + 2x
5 * 5 - 6 = 9 + 2 * 5
25 - 6 = 9 + 10
19 = 19
L = P
2.
2(x - 1) = 5
2x - 2 = 5
2x = 5 + 2
2x = 7
x = 3,5
Sprawdzenie:
2(x - 1) = 5
2(3,5 - 1) = 5
7 - 2 = 5
5 = 5
L = P
Pozdrawiam ;-)