(1/2x+2/3x-3/4x)^2-(1/2x-2/3x-3/4x)^2
=(1/2x+2/3x-3/4x+1/2x-2/3x-3/4x)(1/2x+2/3x-3/4x-1/2x+2/3x+3/4x)
=(1/x-6/4x)(4/3x)
=4/3x^2-2/x^2
=-2/3x^2
(1/2x+2/3x-3/4x)^2-(1/2x-2/3x-3/4x)^2=?
(1/2x+2/3x-3/4x)^2-(1/2x-2/3x-3/4x)^2=?
数学人气:336 ℃时间:2020-03-18 05:50:14
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