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b)4b-2a-8c=-2a+4b-8c=-2(a-2b+4c) -2(a-2b+4c)=(-2)*6 -2(a-2b+4c)=-(12) 4b-2a-8c=-12
c)1/2a-b+2c= 1/2(-2(a-2b+4c) 1/2((a-2b+4c)=1/2*6 1/2(a-2b+4c)=3 -2(a-2b+4c)-3=3-3=0 1/2a-b+2c-3=0
może pomogłe i licze na naj!!!!!!!!!!!!!