[(3x+y)虏-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) 是[(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
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![[(3x+y)虏-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) 是[(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)](/uploads/image/z/15204466-10-6.jpg?t=%5B%283x%2By%29%E8%99%8F-3%283x-y%29%28x%2By%29-%28x-3y%29%28x%2B3y%29%5D%C3%B7%282xy%29+%E6%98%AF%5B%283x%2By%29%26%23178%3B-3%283x-y%29%28x%2By%29-%28x-3y%29%28x%2B3y%29%5D%C3%B7%282xy%29)
[(3x+y)虏-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) 是[(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
[(3x+y)虏-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
是[(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
[(3x+y)虏-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) 是[(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
原式=(9x²+6xy+y²-9x²-6xy+9y²-x²+9y²)÷2xy
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[(3x+y)虏-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) 是[(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
计算:(x+3y)(x-3y)-(x-3y)