3x-1/2x 的五次方怎么化简?
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(3x-1/2x)²=9x²+1/(4x²)-3
( 3x-1/2x)^4 = (3x-1/2x)²×(3x-1/2x)²=[9x²+1/(4x²)-3]²
=[9x²+1/(4x²)]²+3²-2×3×[9x²+1/(4x²)]
=81x^4+1/(16x^4)
(3x-1/2x)^5=( 3x-1/2x)^4×(3x-1/2x)
=243x^5+3/(16x³)-(81x³)/2-1/(32x^5),8,
( 3x-1/2x)^4 = (3x-1/2x)²×(3x-1/2x)²=[9x²+1/(4x²)-3]²
=[9x²+1/(4x²)]²+3²-2×3×[9x²+1/(4x²)]
=81x^4+1/(16x^4)
(3x-1/2x)^5=( 3x-1/2x)^4×(3x-1/2x)
=243x^5+3/(16x³)-(81x³)/2-1/(32x^5),8,
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