(1/2x²y-2xy+y²)·3xy等于多少?
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(1/2x²y-2xy+y²)·3xy等于多少?(1/2x²y-2xy+y²)·3xy等于多少?(1/2x²y-2xy+y²)·3xy等于多
(1/2x²y-2xy+y²)·3xy等于多少?
(1/2x²y-2xy+y²)·3xy等于多少?
(1/2x²y-2xy+y²)·3xy等于多少?
(1/2x²y-2xy+y²)·3xy
=3/2x²y²-6x²y²+3xy^3
=-9/2x²y²+3xy^3