若(X+Y)(1-X-Y)=-6,則X+Y的值是多少
若(X+Y)(1-X-Y)=-6,則X+Y的值是多少
數(shù)學(xué)人氣:544 ℃時間:2020-07-24 01:34:30
優(yōu)質(zhì)解答
(X+Y)(X+Y-1)=6 (X+Y)(X+Y)-(X+Y)-6=0 (X+Y+2)(X+Y-3)=0 X+Y=-2或X+Y=3
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