(5x-4y-3xy)-(8x-y+2xy)
=5x-4y-3xy-8x+y-2xy
=-3x-3y-5xy
=-3(x+y)-5xy
=-18-20
=-38
诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy)
诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy)
数学人气:918 ℃时间:2019-11-09 19:03:46
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