(x的2次方-9)分之2x+(9-x的2次方)分之6

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(x的2次方-9)分之2x+(9-x的2次方)分之6

(x的2次方-9)分之2x+(9-x的2次方)分之6
=(x的2次方-9)分之2x-(x的2次方-9)分之6
=(x-3)(x+3)分之(2x-6)
=(x-3)(x+3)分之2(x-3)
=(x+3)分之2