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已知 19x 31 13x 17

A 试题分析:首先要对原式正确因式分解,然后进行对号入座,即可得出字母的值.解:原式=(13x﹣17)(19x﹣31﹣11x+23)=(13x﹣17)(8x﹣8),∵可以分解成(ax+b)(8x+c),∴a=13,b=﹣17,c=﹣8,∴a+b+c=﹣12.故选A.点评:各项有公因式...

A

题目有误,没有d (19x-31)(13x-17)-(13x-17)(11x-24) =(19x-31-11x+24)(13x-17) =(8x-7)(13x-17) =104x^2-136x-91x+119 =104x^2-227x+119 (ax+b)(8x+c) =8ax^2+acx+8bx+bc =8ax^2+(ac+8b)x+bc (19x-31)(13x-17)-(13x-17)(11x-24...

(19x-31)(13x-17)-(13x-17)(11x-23)=(13x-17)[(19x-31)-(11x-23)]=(13x-17)(8x-8)∵(19x-31)(13x-17)-(13x-17)(11x-23)可因式分解成(ax+b)(8x+c),∴a=13,b=-17,c=-8,∴a+b+c=13-17-8=-12.

左式=(8x-8)(13x-17)=104x^2-240x+136 右式=8ax^2+(8b+ac)x+bc 所以8a=104 a=13 8b+ac=8b+13c=-240 bc=136 c=-8 b=-17 所以a+b+c=-12

(19x-31)(13x-17)-(13x-17)(11x-23) =(13x-17)(19x-31-11x+23) =(13x-17)(8x-8) =(ax+b)(8x+c) 所以:a=13,b=-17,c=-8 故:a+b+c=-12 希望我的回答对你有帮助,采纳吧O(∩_∩)O!

(19x-31)(13x-17)-(13x-17)(11x-23) =(13x-17)(19x-31-11x+23) =(13x-17)(8x-8) =8(x-1)(13x-17) a+b+c+d=8-1+13-17=3

(19x-31)(13x-17)-(13x-17)(11x-23) =(13x-17)(19x-31-11x+23) =(13x-17)(8x-8) =(ax+b)(8x+c) 所以a=13,b=-17,c=-8 a+b-c=4

(19x-31)(13x-17)-(13x-17)(11x-23) =(13x-17)(19x-31-11x+23) =(13x-17)(8x-8) =(ax+b)(8x+c) 所以a=13,b=-17,c=-8 a+b-c=4请采纳回答

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