6X-10X²+12X²-5X
=X(6-5)+X²(12-10)
=X+2X²
-2X³+3X²-2X³+2X³-X²
=X³(-2-2+2)+X²(3-1)
=-2X³+2X²
X²Y-3XY²+2YX²-Y²X
=X²Y(1+2)+XY²(-3-1)
=3X²Y-4XY²
合并同类项,因为刚学6X-10X²+12X²-5X-2X³+3X²-2X³+2X³-X²X²Y-3XY²+2YX²-Y²
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