✔ 最佳答案
A) +12/-16
=-3/4
B) -1.2/4
=-12/40
=-3/10
C) (-5/2) 除(-5/12)
=(-5/2)x(-12/5)
=+16
D) (-12)(-8)(15)
_ _________
-(30)(-30)
= (+96)(15)
- _______
-1080
=-1440
______
-1080
=4/3
F) (3x)(2y+6xy)
=(3x)(2y)+(3x)(6xy)
=6xy+18x^2y
G) (7)(6y-4y^2-7y)
=(7)(-y-4y^2)
=-7y-28y^2
H) (7x)(6y-4y^2-7y)
=(7x)(-y-4y^2)
=-7xy-28y^2x
L) (2x+1)(2)+(7x-2)(x)
=(4x+2)+(7x^2-2x)
=4x+2+7x^2-2x
=2x+7x^2+2
M) (3x+1)(4)-(4x-2)(x)
=(12x+4)-(4x^2-2x)
=12x+4-4x^2+2x
=14x-4x^2+4
E,I,J,K根本不是數來的,或許你打錯了,你改回正確的數啦!!!到時我再答返果幾條。
^2 姐係2次方
希望你睇得明啦,如果有任何問題,你可以問返我嫁
圖片參考:
http://hk.yimg.com/i/icon/16/3.gif
2007-09-04 17:20:07 補充:
呀,我明啦E) (3)(2xy 6^2)=6xy 18x^2I)(2x 6)(2x^2)=4x^3 12x^2J) (-4x)^2(5x) 1=80x^3 1K) -(4x)^2(5x 1)=-(16x^2)(5x 1)=-80x^3 16x^2=-80x^3 16x^2有唔明的地方,你都可以問返我,我會盡力答你的。=]]
2007-09-04 17:22:19 補充:
''' '''係多左多來的,你當睇唔到就得啦!!!!
參考: 自己...