(4y-3)(2y-1)-4(5y-6)
(5x +4y)(5x-4Y) - ( x+2y)^2
x^2 + x + 2/9
use factorization thx!
更新1:
x2+x+2/9 = (1/9)(9x2+9x+2) = (1/9)(3x+1)(3x+2) detail plz
MATHZ (F.3) 4Q before 6 p.m
2008-09-10 1:19 am
(b-4)(b+2)-27
(4y-3)(2y-1)-4(5y-6)
(5x +4y)(5x-4Y) - ( x+2y)^2
x^2 + x + 2/9
use factorization thx!
(4y-3)(2y-1)-4(5y-6)
(5x +4y)(5x-4Y) - ( x+2y)^2
x^2 + x + 2/9
use factorization thx!
回答 (1)
2008-09-10 1:39 am
✔ 最佳答案
(b-4)(b+2)-27
= b2-2b-8-27
= b2-2b-35
= (b-7)(b+5)
=====
(4y-3)(2y-1)-4(5y-6)
= 8y2-10y+3-20y+24
= 8y2-30y+27
= (4y-9)(2y-3)
====
(5x +4y)(5x-4y)-( x+2y)2
= 25x2-16y2-x2-4xy-4y2
= 24x2-4xy-20y2
= 6(6x2-xy-5y2)
= 4(6x+5y)(x-y)
=====
x2+x+2/9
=(x+1/3)(x+2/3)
Alternative method:
x2+x+2/9
= (1/9)(9x2+9x+2)
= (1/9)(3x+1)(3x+2)
=
收錄日期: 2021-04-24 09:51:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080909000051KK01276