toan

F

final_fantasy_vii

duong121234 said:
anh nao pro giai ho em cai em nghi mai ko ra:(

cho a+b+c=1 ; a^2+b^2+c^2=1 ;y/b=x/a=z/c
tinh': xy+yz+zx=?

Anh nao giai ho em cam on nha nick chat em ne` :
ki_si_den_1992@yahoo.com.vn
Bấm để xem đầy đủ nội dung ...

7a614fd489aecf11a675.gif


Chẳng biết đúng ko nữa :D
 
D

duong121234

cám ơn bài làm của bạn thật hay ;), bạn học lớp mấp vậy chắc cấp 3 cho mình làm quen nhe:D
nick của mình là:ki_si_den_1992@yahoo.com.vn
 
K

koisiujing

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dragon
 
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