1若|x-4|=3,-y=3,则x-y的值等于
问题描述:
1若|x-4|=3,-y=3,则x-y的值等于
2若-abc>0,且b、c异号,则a___0(用“>”或“
答
1若|x-4|=3,-y=3,则x-y的值等于4和10
2若-abc>0,且b、c异号,则a__>_0(用“>”或“