(x+y)(5-x-y)-6=0 (x+y)[5-(x+y)]-6=0 (x+y)^2-5(x+y)+6=0 [(x+y)-2][(x+y)-3]=0 x+y=2,x+y=3
(x+y)(5-x-y)-6=0,则x+y的值为?
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