计算[(x+y)平方-(x-y)平分-4x平分y平分]÷(2xy)

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计算[(x+y)平方-(x-y)平分-4x平分y平分]÷(2xy)计算[(x+y)平方-(x-y)平分-4x平分y平分]÷(2xy)计算[(x+y)平方-(x-y)平分-4x平分y平分]÷(2xy)[

计算[(x+y)平方-(x-y)平分-4x平分y平分]÷(2xy)
计算[(x+y)平方-(x-y)平分-4x平分y平分]÷(2xy)

计算[(x+y)平方-(x-y)平分-4x平分y平分]÷(2xy)
[(X+Y)²-(X-Y)²-4X²Y²]/(2XY)
=[(X+Y-X+Y)(X+Y+X-Y)-4X²Y²]/(2XY)
=[4XY-4X²Y²]/(2XY)
=4XY[1-XY]/(2XY)
=2[1-XY]
=2-2XY

等于2加2xy

原式=(x²+2xy+y²-x²+2xy-y²-4x²y²)÷2xy
=(4xy-4x²y²)÷2xy
=2-2xy