因式分解 一條數學題

2011-10-01 2:02 am
(40^2+48+8)-(15^2-7y^-2y)
更新1:

(40^2+48y+8)-(15^2-7y^-2y)

更新2:

1.5y^2+6y+1 2.15y^2-7y-2 由此,因式分解 (40y^2+48y+8)-(15y^3-7y^2-2y)

回答 (3)

2011-10-02 1:16 am
✔ 最佳答案
你好~~~

1) 5y^2 + 6y + 1

= (5y + 1)(y + 1)

2) 15y^2 - 7y - 2

= (5y + 1)(3y - 2)

3) (40y^2 + 48y + 8) - (15y^3 - 7y^2 - 2y)

= 8(5y^2 + 6y + 1) - y(15y^2 - 7y - 2)

= 8(5y + 1)(y + 1) - y(5y + 1)(3y - 2)

= (5y + 1)[8(y + 1) - y(3y - 2)]

= (5y + 1)(8y + 8 - 3y^2 + 2y)

= -(5y + 1)(3y^2 - 10y - 8)

希望可以幫到你~~~~~
參考: Yogi
2011-10-04 7:01 am
GOOD~~~~~~
2011-10-01 2:08 am
1600+56-(225-29y^2)
=1431+29^2


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