(s-2t)(-s-2t)-(s-2t)²=什么?
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![(s-2t)(-s-2t)-(s-2t)²=什么?](/uploads/image/z/4983317-53-7.jpg?t=%EF%BC%88s-2t%29%28-s-2t%29-%28s-2t%29%26%23178%3B%3D%E4%BB%80%E4%B9%88%3F)
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(s-2t)(-s-2t)-(s-2t)²=什么?
(s-2t)(-s-2t)-(s-2t)²=什么?
(s-2t)(-s-2t)-(s-2t)²=什么?
(s-2t)(-s-2t)-(s-2t)²
=-(s-2t)(s+2t)-(s-2t)²
=-s²+4t²-s²+4st-4t²
=-(2s²-4st)
=2s(2t-s)
(s-2t)(-s-2t)-(s-2t)²
=-(s-2t)(s+2t)-(s-2t)²
=-(s-2t)[s+2t-(s-2t)]
=-4t(s-2t)