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標題:
3條簡單Factorize的數學題,唔該幫下,要快
發問:
1.Factorize x^2-5x+6=? 2.Factorize 65-8x-x^2=? 3.Factorize 2x^2-3x-54=?
最佳解答:
By cross - method, ( 1 ) x^2 - 5x - 6 = ( x - 2 )( x - 3 ) x - 2 x - 3 --------------- -2x - 3x = - 5x ( 2 ) 65 - 8x - x^2 = - ( x^2 + 8x - 65 ) = - ( x + 13 )( x - 5 ) x + 13 x - 5 ------------------ 13x - 5x = 8x ( 3 ) 2x^2 - 3x - 54 = ( 2x + 9 )( x - 6 ) 2x + 9 x - 6 ----------------- 9x - 12x = - 3x 2007-08-23 00:26:57 補充： Sorry for typing error in the 1st line, it should be x^2 - 5x + 6 = ( x - 2 )( x - 3 )
其他解答:
3條簡單Factorize的數學題,唔該幫下,要快
發問:
1.Factorize x^2-5x+6=? 2.Factorize 65-8x-x^2=? 3.Factorize 2x^2-3x-54=?
最佳解答:
By cross - method, ( 1 ) x^2 - 5x - 6 = ( x - 2 )( x - 3 ) x - 2 x - 3 --------------- -2x - 3x = - 5x ( 2 ) 65 - 8x - x^2 = - ( x^2 + 8x - 65 ) = - ( x + 13 )( x - 5 ) x + 13 x - 5 ------------------ 13x - 5x = 8x ( 3 ) 2x^2 - 3x - 54 = ( 2x + 9 )( x - 6 ) 2x + 9 x - 6 ----------------- 9x - 12x = - 3x 2007-08-23 00:26:57 補充： Sorry for typing error in the 1st line, it should be x^2 - 5x + 6 = ( x - 2 )( x - 3 )
其他解答:
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