求化简 y=(x-5)(100-7(x-7))急

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求化简 y=(x-5)(100-7(x-7))急
求化简 y=(x-5)(100-7(x-7))急

求化简 y=(x-5)(100-7(x-7))急
y=(x-5)(149-7x)
=149x-7x^2-745+35x
=-7x^2+184x-745