感激阿番的解答,謝謝! 仲有一題唔知點做,煩請代為解答。 f(x)=x²-3x + 2,則 2f(x)-f(x-1)= ?

2015-11-01 10:21 am

回答 (1)

2015-11-01 10:40 am
請參考可能錯
2f(x)-f(x-1)
=2(x^2-3x+2)-[(x-1)^2-3(x-1)+2]
=2x^2-6x+4-(x^2-2x+1-3x+3+2)
=2x^2-6x+4-x^2+5x-6
=x^2-x-2


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