Odpowiedzi

2010-02-18T20:57:18+01:00
A = -1, b = ⅔ c = 0,5.

a) -3a + 2b - 4c + 4b - 2a + 2c = -5a+6b-2c
-5*(-1)+6*(2/3)-2*0,5 = 5+4-1 = 8

b) 2a²b + 3ab² - 2bc + 3ac - 2a²b - ac + 3ab² = 6ab²+2ac-2bc
6*(-1)*(2/3)²+2*(-1)*0,5-2*2/3*0,5 = -6*4/9-1-2/3 = -24/9-9/9-6/9 = - 39/9 = -4⅓

c) -2ab²c + 2a²bc - 3a²bc + ab²c + 4a²bc + 6a²bc² = -ab²c-a²bc+6a²bc²
1*(2/3)²*0,5-(-1)²*2/3*0,5+6*(-1)²*2/3*(0,5)² = 4/9*1/2-2/3*1/2+4*0,25 = 2/9-1/3+1 = 2/9-3/9+9/9 = 8/9
2 4 2