# math

1: (-12xy2z)(3xy)

2: -12xy2z divided by 3xy

3: 2x(2x - 5)

4: -2x(2x-5)

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1. (-12xy^2z)(3xy)
= (-12*3)(x*x)(y^2*y)(z)
= -36 x^2 y^3 z

do the others in like wise...

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