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b) -6(-1xy + 2x2y2 - 4x2y)
c) 3xy(2 - 4xy + 8x)
a) 2(3xy-6xy+12xy)
b) -6(-1xy+2xy-4xy)
c) 3xy(2-4+8)
b)=-6*(-1)xy+(-6)2x²y²-(-6)4x²y=-6((-1)xy+2x²y²-4x²y)
c)=3*2xy-3*4x²y²+3*8x²y=3xy(2-4xy+8x)