A) a*(a+b)-3*(a+b)=(a+b)*(a-3)
b) k*(p-c)-x*(p-c)-(p-c)=(p-c)*(k-x-1)
Такой функции нет
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B1•q^3=80/3
-90•q^3=80/3
q^3=-80/(3•90)
q^3=-8/27
q=-2/3
b1 -90. -90
S = ---- = --------- = ----- = (90•3)/5 = 54
q–1 -2/3–1 -5/3