因式分解問題:(中學)

xy+x+y+1
= x(y+1)+(y+1)
=(y+1)(x+1)

2006-10-25 23:35:10 補充：
你只要搵倒佢地既Common factor，咁就將佢地Group埋一齊就好似上面咁，你見倒兩邊都有y 1呢個factor，咁就可以Group埋一齊啦 ^^唔明再sd個e-mail問我啦 =]

2006-10-25 23:36:03 補充：
修正：你見倒兩邊都有y 1呢個factor

2006-10-25 23:36:54 補充：
再修正[唔知點解y同1之間出唔倒個加..]：你見倒兩邊都有y加1呢個factor

xy+x+y+1
=(xy+x)+(y+1)
=x(y+1)+1(y+1)
=(x+1)(y+1)

xy+x+y+1
=x(y+1)+(y+1)
=(y+1)(x+1)

xy+x+y+1
=x(y+1)+(y+1)
=(y+1)(x+1)