3 x 3^2n+1-21 x 9^n求价
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3x3^2n+1-21x9^n求价3x3^2n+1-21x9^n求价3x3^2n+1-21x9^n求价3x3^2n+1-21x9^n=3x3^2n+1-7x3x3^2n=3x3^2n+1-7x3^2n
3 x 3^2n+1-21 x 9^n求价
3 x 3^2n+1-21 x 9^n
求价
3 x 3^2n+1-21 x 9^n求价
3 x 3^2n+1-21 x 9^n
=3 x 3^2n+1-7 x3 x3^2n
=3 x 3^2n+1-7 x3^2n +1
=3^2n +1(3-7)
=-4x 3^2n +1
3 x 3^2n+1-21 x 9^n
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3 x 3^2n+1-21 x 9^n求价
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