If -2x>3y, is X negative?
(1)y>0
(2)2x+5y-20=0
answer
怎样解的呢!谢谢
(1)y>0,所以3y>0,-2x>3y>0,所以x<0
(2)2x+3y+2y-20=0,因为 -2x>3y,2x+3y<0,所以 2y-20>0,y>10
x=(20-5y)/2<(20-50)/2=-15
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