中三數學題

2009-05-27 11:07 pm

factorize
...... 2..............................2
(x+2) - (x+2)(y-3) - 6(y-3)

唔洗理d點點, 上面個2係2次咁解
唔該哂~

回答 (3)

2009-05-28 3:53 am

✔ 最佳答案

(x+2)2 - (x+2)(y-3) - 6(y-3)2
=[(x+2)-3(y-3)][(x+2)+2(y-3)]
=(x+2-3y+9)(x+2+2y-6)
=(x-3y+11)(x+2y-4)

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2009-05-28 12:39 am

同學..你6(y-3)上面果個2次方係for (y-3)定係6(y-3)?
兩樣都唔同計法
樓上ge答案好似少左個2次方呢!

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2009-05-28 12:13 am

=(x+2)^2 - (x+2)(y-3) - 6(y-3)

=(x+2)(x+2) - (xy -3x +2y -6) -6y +18

=x^2 + 2x + 2x + 4 -xy +3x -2y +6 -6y +18

ANS=x^2 -xy + 7x -8y +22

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