(p-4)(p+1)+3p怎么做?4XY²-4X²Y-Y³怎么做?

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(p-4)(p+1)+3p怎么做?4XY²-4X²Y-Y³怎么做?(p-4)(p+1)+3p怎么做?4XY²-4X²Y-Y³怎么做?(p-4

(p-4)(p+1)+3p怎么做?4XY²-4X²Y-Y³怎么做?
(p-4)(p+1)+3p怎么做?
4XY²-4X²Y-Y³怎么做?

(p-4)(p+1)+3p怎么做?4XY²-4X²Y-Y³怎么做?
(p-4)(p+1)+3p
=p²-3p-4+3p
=p²-4
=(p+2)(p-2)
4XY²-4X²Y-Y³
=y(4xy-4x²-y²)
=-y(2x-y)²

p-4)(p+1)+3p

(p-4)(p+1)+3p
=p²-3p-4+3p
= p²-4
=(p+2)(p-2)
4XY²-4X²Y-Y³
=Y(4XY-4X²-Y²)
=-Y(4X²-4 XY+Y²)
=-Y(2X-Y) ²