Rozwiąż :
a) a( b - c) + b ( c-a) + c( a-b)
b) 3x kwadrat + 4 + 1/7 * (14x kwadrat - 21)/ 6
c)(15 p kwadrat - 9p) / 6 - 6 * (1-6p)/4
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a) ab-ac+bc-ba+ca-cb