①展開して
(与式)=x^2+2x-15-(x^2-4x+4)
=6x-19
②(与式)=3(x^2-9)
=3(x+3)(x-3)
③展開して
(与式)=x^2-7x+10+2x-16
=x^2-5x-6
=(x+1)(x-6)
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