诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy)

19851162022-10-04 11:39:542条回答

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kuanyue 共回答了15个问题 | 采纳率100%: (5x-4y-3xy)-(8x-y+2xy)
=5x-4y-3xy-8x+y-2xy
=-3x-3y-5xy
=-3(x+y)-5xy
=-18-20
=-38; 1年前

马元元共回答了21806个问题 | 采纳率: (5x-4y-3xy)-(8x-y+2xy)
=5x-4y-3xy-8x+y-2xy
=-3x-3y-5xy
=-3(x+y)-5xy
=-18-20
=-38; 1年前

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