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a) A+B=(A1+B1,A2+B2)=(1+0,0+2)=(1,2)
b) 2A-B=(2A1-B1,2A2-B2)=(2-0,0-2)=(2,-2)
c) A-3B=(A1-3B1,A2-3B2)=(1-0,0-6)=(1,-6)