John can play both the acoustic and .................... . ( electricity )

dat 3^m=a(a_{^{>0)  ta co}}

_^{a^2-}a=n^4+2n^3+n^2+2n

de thay (2n^2+n)^2<(2a-1)^2<(2n^2+n+2)^2

suy ra (2a-1)^2=(2n^2+n+1)^2

phan sau tu lam nhe

ta có x/3=y/4=y/5

=>=4 mik đã làm

=>2x²=72 =>x²=36 => x=6

2y²=128=>y²=64=>y=8

3z²=300=>z²=100=>z=10

=>(x+y+z)²=(6+8+10)²=576

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