1. Prawda Prawda Prawda 2. x+3=5(x-1) x+3 = 5x - 5 x - 5x = -5 - 3 x = 2 4(x-1) - 1 = 2x - 3 + 2(x-1) 4x - 4 - 1 = 2x - 3 + 2x - 2 4x - 2x - 2x = -3 - 2 +4 + 1 0 = 0 Odpowiedz B 3. C 4. A 5. 2^7 + 2*7 = 2 * 2^7 = 2^1*2^7 = 2^8 6. falsz falsz 7. -3x(2x-5y) = -6x^2 + 15xy odpowiedz B 8. wiek ewy - x wiek mamy ewy - x + 28 2x + 28 = 46 2x = 46-28 2x= 18 x = 9 wiek ewy - x = 9 wiek mamy ewy - x + 28 = 28 + 9 = 37 37+9=46 Pozdrawiam.
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Verified answer
1. Prawda
Prawda
Prawda
2.
x+3=5(x-1) x+3 = 5x - 5 x - 5x = -5 - 3 x = 2
4(x-1) - 1 = 2x - 3 + 2(x-1) 4x - 4 - 1 = 2x - 3 + 2x - 2 4x - 2x - 2x = -3 - 2 +4 + 1
0 = 0
Odpowiedz B
3. C
4. A
5. 2^7 + 2*7 = 2 * 2^7 = 2^1*2^7 = 2^8
6. falsz falsz
7. -3x(2x-5y) = -6x^2 + 15xy odpowiedz B
8. wiek ewy - x wiek mamy ewy - x + 28 2x + 28 = 46 2x = 46-28 2x= 18 x = 9 wiek ewy - x = 9 wiek mamy ewy - x + 28 = 28 + 9 = 37 37+9=46 Pozdrawiam.