化简:(1/3a-3/4b)^2-(1/3a+3/4b)^2
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化简:(1/3a-3/4b)^2-(1/3a+3/4b)^2
(1/3a-3/4b)^2-(1/3a+3/4b)^2
=(1/3a-3/4b+1/3a+3/4b)(1/3a-3/4b-1/3a-3/4b)
=2/3a×(-3/2)b
=-ab
(1/3a-3/4b)^2-(1/3a+3/4b)^2
=(1/3a-3/4b+1/3a+3/4b)(1/3a-3/4b-1/3a-3/4b)
=2/3a*(-3/2b)
=-ab