化简:(3x-4y)(3x+4y)-(5x-2y)2.
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化简:(3x-4y)(3x+4y)-(5x-2y)2.
原式=9x2-16y2-25x2+20xy-4y2
=-16x2-20y2+20xy.
=-16x2-20y2+20xy.
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化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
先化简,再求值:(x+y)(2x-y)-(x+2y)(x-2y),其中x=3,y=4.
先化简在求值 (x+5y)(x+4y)-(x-y)(x+y),其中,x=-2又2/3,y=3/7