X的2n次方等于5,求(2X的3n次方)的2次方减3(X的n次方)的4次方(过程)?
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X^(2n)=5
[2X^(3n)]^2-3[x^n]^4
=4x^(6n)-3x^(4n)
=4[x^(2n)]^3-3[x^(2n)]^2
=4×5^3-3×5^2
=4×125-3×25
=500-75
=425,7,X的2n次方等于5,
(2X的3n次方)的2次方减3(X的n次方)的4次方
=4X^6n -3X^4n
=4*5^3 -3*5^2
=500 -75
=425,1,
[2X^(3n)]^2-3[x^n]^4
=4x^(6n)-3x^(4n)
=4[x^(2n)]^3-3[x^(2n)]^2
=4×5^3-3×5^2
=4×125-3×25
=500-75
=425,7,X的2n次方等于5,
(2X的3n次方)的2次方减3(X的n次方)的4次方
=4X^6n -3X^4n
=4*5^3 -3*5^2
=500 -75
=425,1,
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