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3x²-xy(-2y*3x)
3x²-xy*(-6xy)
3x²+6x²y²
b) (A+B)*C
(3x²-xy-2y)*3x
3x³-3x²y-6xy
b) (3x²-xy+(-2y))*3x=(3x²-xy-2y)*3x=9x³-3x²y-6xy