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b) 4xy - 3xz=4·(-6)·(-2)-3·(-6)·(-3)=48-54= - 6
c) xyz - 2z²=(-6)·(-2)·(-3)-2·(-3)²=-36-2·9=-36-18= - 54
d) -2xz - 5x²=2·(-6)·(-3)-5·(-6)²=36-5·36=36-180= - 144