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=(2+v5+6v5+15)/(4-5)=
=(17+7v5)/(-1)=
=-17-7v5
b)
policze składniki sumy osobno, później dodam wyniki:
1/(v3+v2) * (v3-v2)/(v3-v2)=(v3-v2)/(3-2)=
=(v3-v2)/1=v3-v2
1/(v3-v2) *(v3+v2)/(v3+v2)=
=(v3+v2)/(3-2)=v3+v2
razem:
v3-v2 + v3+v2=2v3