计算;(1)(x-3y)(x- 1 2 y);(2)4x 2 -(-2x+3)(-2x-3)
计算;(1)(x-3y)(x-12y);(2)4x2-(-2x+3)(-2x-3)....
计算;(1)(x-3y)(x- 1 2 y);(2)4x 2 -(-2x+3)(-2x-3).
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浮生梦魇TA0527
2014-11-29
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(1)(x-3y)(x- y), =x 2 - xy-3xy+ y 2 , =x 2 - xy+ y 2 ;
(2)4x 2 -(-2x+3)(-2x-3), =4x 2 -(4x 2 -9), =9. |
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