4q(1-q)的立方+2(p-1)的平方 (x-y)的4次方+x(x-y)的立方+y(y-x)的立方
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原式=4q(1-q)³+2(1-p)²

=2(1-p)²[2(1-p)+1]

=2(1-p)²(3-2p)

原式= (x-y)⁴+x(x-y)³-y(x-y)³

=(x-y)³[(x-y)+x-y]

=2(x-y)³(x-y)

=2(x-y)⁴

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