若x^n=2,y^n=3则1 .(xy)^3n (3x^3n)^2+4(x^2)^2n1 .(xy)^3n 2.(3x^3n)^2+4(x^2)^2n

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若x^n=2,y^n=3则1 .(xy)^3n (3x^3n)^2+4(x^2)^2n1 .(xy)^3n 2.(3x^3n)^2+4(x^2)^2n
若x^n=2,y^n=3则1 .(xy)^3n (3x^3n)^2+4(x^2)^2n
1 .(xy)^3n 2.(3x^3n)^2+4(x^2)^2n

若x^n=2,y^n=3则1 .(xy)^3n (3x^3n)^2+4(x^2)^2n1 .(xy)^3n 2.(3x^3n)^2+4(x^2)^2n
(xy)^3n
=[(xy)^n]^3
=(x^n*y^n)^3
=(2*3)^3
=6^3
=216
(3x^3n)^2+4(x^2)^2n
=9x^6n+4x^4n
=9*(x^n)^6+4*(x^n)^4
=9*2^6+4*2^4
=9*8+4*16
=72+64
=136