若3^x=4,3^y=6,求9^2x-y+27^x-y

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若3^x=4,3^y=6,求9^2x-y+27^x-y若3^x=4,3^y=6,求9^2x-y+27^x-y若3^x=4,3^y=6,求9^2x-y+27^x-y9^2x-y+27^x-y=9^2x÷

若3^x=4,3^y=6,求9^2x-y+27^x-y
若3^x=4,3^y=6,求9^2x-y+27^x-y

若3^x=4,3^y=6,求9^2x-y+27^x-y
9^2x-y+27^x-y
=9^2x÷9^y-27^x÷27^y
=3^4x÷3^2y-3^3x÷3^3y
=(3^x)^4÷(3^y)^2-(3^x)^3÷(3^y)^3
=256÷36-64÷216
=184/27

9^2x-y+27^x-y
=(3^2)^(2x-y)+(3^3)^(x-y)
=3^(4x-2y)+3^(3x-3y)
=4^4÷6^2+4^3÷6^3
=170/27

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