1、(x-2y-1)(x-2y+1)-(x-2y-1)^2,其中x=1.5,y=3.9
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1、(x-2y-1)(x-2y+1)-(x-2y-1)^2,其中x=1.5,y=3.91、(x-2y-1)(x-2y+1)-(x-2y-1)^2,其中x=1.5,y=3.91、(x-2y-1)(x-2
1、(x-2y-1)(x-2y+1)-(x-2y-1)^2,其中x=1.5,y=3.9
1、(x-2y-1)(x-2y+1)-(x-2y-1)^2,其中x=1.5,y=3.9
1、(x-2y-1)(x-2y+1)-(x-2y-1)^2,其中x=1.5,y=3.9
(x-2y-1)(x-2y+1)-(x-2y-1)^2
=(x-2y-1)[(x-2y+1)-(x-2y-1)]
=(x-2y-1)(x-2y+1-x+2y+1)
=2(x-2y-1)
当x=1.5,y=3.9时,
原式=2(1.5 - 7.8-1)
=2*(-7.3)
=-14.6
答案:-14.6
[(x-2y)-1][(x-2y)+1]-[(x-2y)-1]^2
=(x-2y)^2 -1 -[(x-2y)^2 -2(x-2y)+1]
=2(x-2y)-2=2·(1.5-2·3.9)-2=-14.6
0解;原式=(x-2y-1)[(x-2y+1)-(x-2y-1)]
=2x-4y-2
当x=1.5,y=3.9时
原式=2*1.5-4*3.9-2
=-14.6
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