(x+2)(x+3)-(x+6)(x-1) 怎么算?

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(x+2)(x+3)-(x+6)(x-1) 怎么算?

(x+2)(x+3)-(x+6)(x-1) 怎么算?
(x+2)(x+3)-(x+6)(x-1) 怎么算?

(x+2)(x+3)-(x+6)(x-1) 怎么算?
(x+2)(x+3)-(x+6)(x-1)
=x²+5x+6-x²-5x+6
=6+6
=12

(x+2)(x+3)-(x+6)(x-1)
=x^2+5x+6-x^2-5x+6
=12

(x+2)(x+3)-(x+6)(x-1) =(x^2+5x+6)-(x^2+5x-6)=x^2+5x+6-x^2-5x+6=12

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