3x^2+2xy-4y^2-(3xy-4y^2+3x^2) 急了答对给分
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3x^2+2xy-4y^2-(3xy-4y^2+3x^2) 急了答对给分
![3x^2+2xy-4y^2-(3xy-4y^2+3x^2) 急了答对给分](/uploads/image/z/9212473-1-3.jpg?t=3x%5E2%2B2xy-4y%5E2-%283xy-4y%5E2%2B3x%5E2%29+%E6%80%A5%E4%BA%86%E7%AD%94%E5%AF%B9%E7%BB%99%E5%88%86)
3x^2+2xy-4y^2-(3xy-4y^2+3x^2)
=3x^2+2xy-4y^2-3xy+4y^2-3x^2
=-xy
=3x^2+2xy-4y^2-3xy+4y^2-3x^2
=-xy
3x^2+2xy-4y^2-(3xy-4y^2+3x^2) 急了答对给分
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