zadanie 12 , 162,1 gimnazjum(podręcznik;matematyka z plusem)
b) 3(z-y)-a(z-y)
c) (m-1)(k-1)+(k-1)(m+1)
d) (a-1)(b+c)-(a-1)(b-c)
Zadanie 31.uprość podane wyrażenia
a) 3x-6
------- - 5
3
b) 3a-9b 2a-4b
-------- - -------
3 2
c) 2x+6 6x-9
------ - ------
2 3
x-7 x-1
d) 4 razy ------ + 9 razy ----
2 3
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zad 31
a) 3x-6
------- - 5 = 3x - 2 - 5 = 3x - 7
3
b) 3a-9b 2a-4b 6a - 18b 6a - 12 b 6b
-------- - ------- = --------- - ------------ = ------------ = b
3 2 6 6 6
c) 2x+6 6x-9 6x+18 12x- 18 -6x
------ - ------ = ---------- - ---------- = -----------
2 3 6 6 6
x-7 x-1
d) 4 razy ------ + 9 razy ---- = 2x - 14 + 3x - 3 = 5x - 17
2 3
Chyba to jest dobrze, ale nie jestem pewna.