Question

Cho và thỏa mãn .Khi đó: x – y bằng mấy

cần nhanh,gấp

ai xong mk tick

Answer 1

TL :

x - y = 2

HT

Answer 2

TL:

2 nhé 

nhầm

s

-HT-

Answer 3

ta có:xy(x+y)=x2−xy+y2⇒1x+1y=1x2+1y2−1xy⇔1x+1y=14(1x+1y)2+34(1x−1y)2≥14(1x+1y)2⇒0≤1x+1y≤4xy(x+y)=x2−xy+y2⇒1x+1y=1x2+1y2−1xy⇔1x+1y=14(1x+1y)2+34(1x−1y)2≥14(1x+1y)2⇒0≤1x+1y≤4

mặt khác:A=1x3+1y3=(1x+1y)2≤16A=1x3+1y3=(1x+1y)2≤16

vậyMaxA=16;"="⇔x=y=12

Answer 4

TL:

x-y=12

-HT-

sai mik sorry nha

Answer 5

đúng k vậy=v

Answer 6

TL:

 x - y =2

HT

Answer 7

TL

Khi đó :

x-y =2

Hok tốt nha bn

 

Answer 8

x - y =2

hok tot