bất đẳng thức

C

coganghoctapthatgioi

j

a^4+b^4-a^3b-b^3a
=a^3(a-b)-b^3(a-b)
=(a-b)(a^3-b^3)
=(a-b)^2(a^2-ab+b^2)\geq0
dấu= xảy ra khi x=y
 
M

minh_minh1996

7kWM8.png

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