若(x-1)(y+2)=0,则x=1或y=-2的否命题是_____
问题描述:
若(x-1)(y+2)=0,则x=1或y=-2的否命题是_____
答
若(x-1)(y+2)=0,则x=1或y=-2的否命题是
若(x-1)(y+2)=0,则x≠1且y≠-2