12(x-2y)²-17(x-2y)³+13(2y-x)²-10(2y-x)³
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12(x-2y)²-17(x-2y)³+13(2y-x)²-10(2y-x)³
12(x-2y)²-17(x-2y)³+13(2y-x)²-10(2y-x)³
12(x-2y)²-17(x-2y)³+13(2y-x)²-10(2y-x)³
=12(x-2y)²+13(x-2y)²-17(x-2y)³+10(x-2y)³
=25(x-2y)²-7(x-2y)³
=-18(x-2y)
2(x-2y)²-17(x-2y)³+13(2y-x)²-10(2y-x)³
=2(x-2y)²-17(x-2y)³+13(x-2y)²+10(x-2y)³
=15(x-2y)²-7(x-2y)³
=(x-2y)²(15-7x+14y)