По теореме Виета:
x1 + x2 = -p/k
x1*x2 = 3/k
1 - 3 = -p/k
1*(-3) = 3/k
k = 3 : (-3) = -1
-2 = -p/k
k = -1
p = 2*k = 2*(-1) = -2
ответ: k= -1; p = -2.
1) 6.7- 2.5 = 4.2
2) 4.2 / 2.4 = 1.75
-(3/7х²y³)²*(-2 1/3 xy³)³= =(-3/7)*(-7/3)x^4y^6x^3y^9 = x^7y^15