2（2X-7Y)(7Y+2X)+X^2-(-4X+5Y)(-5Y-4X)
=2（4X^2-49Y^2)+X^2-(16X^2-25Y^2)
=8X^2-98Y^2+X^2-16X^2+25Y^2
=-7X^2-73Y^2
化简2（2X-7Y)(7Y+2X)+X^2-(-4X+5Y)(-5Y-4X)
化简2（2X-7Y)(7Y+2X)+X^2-(-4X+5Y)(-5Y-4X)
数学人气：430 ℃时间：2019-09-30 20:37:51
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