數學呀!!好簡單架咋~因式分解~10分

2006-12-15 2:14 am

兩條

x(2次方)-2x-y(2次方)+1

2x(2次方)+x-36

唔該大家>w

ps..x唔係乘,,,係未知數

回答 (3)

2006-12-15 2:22 am

✔ 最佳答案

x^2 - 2x -y^2+1
= x^2 -2x +1 - y^2
= (x - 1)^2 - y^2
= (x - 1 +y) (x - 1 - y)
= (x + y - 1) (x - y - 1)

2x^2 + x -36
= (2x + 9) (x - 4)

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2006-12-17 2:06 am

x(2次方)-2x-y(2次方)+1
=x(2次方)-2x+1-y(2次方)
=(x-1)(2次方)-y(2次方)
=(x-1-y)(x-1+y)

2x(2次方)+x-36
=x(2次方)-6(2次方)
=(x+6)(x-6)

參考: myself

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2006-12-15 2:21 am

1. x(x-2)-y(2次方)+1

2.2x(3次方)-36

參考: me

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