化简(4x²-5xy)-(1/3y²+2x²)+2(3xy-1/4y²-1/12y²)
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化简(4x²-5xy)-(1/3y²+2x²)+2(3xy-1/4y²-1/12y²)
化简(4x²-5xy)-(1/3y²+2x²)+2(3xy-1/4y²-1/12y²)
化简(4x²-5xy)-(1/3y²+2x²)+2(3xy-1/4y²-1/12y²)
(4x²-5xy)-(1/3y²+2x²)+2(3xy-1/4x²-1/12y²)
=4x²-5xy-1/3y²-2x²+6xy-1/2x²-1/6y²
=3/2x²+xy-1/2y²
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