Question

1772🌷

這三題怎麼寫?

Answer 1

✨ 最佳解答 ✨

Ny-Ålesund

13.
原式 = (ab +2a) - (b^2 +4b +4)
= a(b +2) - (b +2)^2
= (b +2) (a-b-2)

14.
原式 = (x^2 -1)(x^2 -11)
= (x+1) (x-1) (x^2 -11)

15.
令 A = (a +b)、B = (a -b)，則 A*B = a^2 -b^2

原式 = A^2 -4A*B +4B^2
= (A -2B)^2
= [ (a+b) - 2*(a-b) ]^2
= (3b -a)^2

1772🌷

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