Odpowiedź:
a)
AB=[1+3,4-2]=[4,2]
CD=[-1-3,-7+5]=[-4,-2]
AB + 2 CD=[4,2]+2[-4,-2]=[4,2]+[-8,-4]=[-4,-2]
b)
BC=[3-1,-5-4]=[2,-9]
AD=[-1+3,-7-2]=[2,-9]
3 BC - 1/2 AD=3[2,-9]-1/2[2,-9]=[6,-27]-[1;-4,5]=[5;-22,5]
c)
AC=[3+3,-5-2]=[6,-7]
DB=[1+1,4+7]=[2,11]
CD=[-1-3,-7+5]=[-4,-2]
BA=[-3-1,2-4]=[-4,-2]
AC + DB + CD + BA=[6,-7]+[2,11]+[-4,-2]+[-4,-2]=[0,0]
d)
AD=[-1+3,-7-2]=[2,-9]
BC=[3-1,-5-4]=[2,-9]
BD=[-1-1,-7-4]=[-2,-11]
4 AD - 6 BC + 5 BD=4[2,-9]-6[2,-9]+5[-2,-11]=[8,-36]-[12,-54]+[-10,-55]=[-14,-37]
Szczegółowe wyjaśnienie:
