factorize ( 急)

2006-10-23 12:57 am

1. (a-1)^2 - 2 ( a-1)
2. x( x-y) + y ( y-x)

show steps pls~
thx ur help

回答 (4)

2006-10-23 1:01 am

✔ 最佳答案

1.
(a-1)^2 -2(a-1)
=(a-1)[(a-1)-2]
=(a-1)(a-1-2)
=(a-1)(a-3)

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

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2006-10-23 1:05 am

1. (a-1)^2 - 2 ( a-1)
=(a-1)(a-1)-2(a-1)
=(a-1){(a-1)-2}
=(a-1)(a-3)

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

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2006-10-23 1:03 am

1. (a-1)^2 - 2(a-1)
= (a-1)((a-1)-2)
=(a-1)(a-3)
2.x(x-y) + y(y-x)
=(x-y)(x-y)
=(x-y)^2

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2006-10-23 1:01 am

1. a^2-2a+1-2a+1 = a^2-4a+1

2. x^2-xy+y^2-xy = x^2-2xy+y^2

參考: me

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