Maths~~

KaTe_TeeNg

(a)(2x - 3)y + xy     
(b) (6x - 5)(x - y) - x(x - y)
(c) (2x + 3)(x - y) + (1 - x)(y - x)

can anyone help me??

mk311111

(a)  (2x - 3)y + xy =y(2x - 3+x)=y(3x-3)=3y(x-1)
(b) (6x - 5)(x - y) - x(x - y)=(x - y)(6x - 5-x)=(x - y)(5x - 5)=5(x - y)(x - 1)
(c) (2x + 3)(x - y) + (1 - x)(y - x)=(2x + 3)(x - y) - (1 - x)( x - y )=( x - y )(2x + 3-1+x)=( x - y )(3x + 2)

[ 本帖最後由 mk311111 於 7/1/2009 05:52 PM 編輯 ]

囧囧中自有囧囧

原帖由 mk311111 於 7/1/2009 05:38 PM 發表

                               
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(a)  (2x - 3)y + xy =y(2x - 3+x)=y(3x-3)+3y(x-1)
(b) (6x - 5)(x - y) - x(x - y)=(x - y)(6x - 5-x)=(x - y)(5x - 5)=5(x - y)(x - 1)
(c) (2x + 3)(x - y) + (1 - x)(y - x)=(2x + 3)(x - y) - (1 - x)( x -  ...

不是=3y(x+1)嗎- -

mk311111

多謝指證