[(b-2a)(-2a-b)-4(a-25)²]怎么做

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[(b-2a)(-2a-b)-4(a-25)²]怎么做
[(b-2a)(-2a-b)-4(a-25)²]怎么做

[(b-2a)(-2a-b)-4(a-25)²]怎么做
(b-2a)(-2a-b)-4(a-25)²
=4a²-b²-4(a-25)²
=4[a²-(a-25)²]-b²
=4(50a-625)-b²
=200a-2500-b²