解不等式:(2k-3)/(k+1)>1
问题描述:
解不等式:(2k-3)/(k+1)>1
答
(2k-3)/(k+1)>1
(2k-3)/(k+1)-(k+1)(k+1)>0
(2k-3-k-1)/(k+1)>0
(k-4)(k+1)>0
∴k<-1或k>4除号为什么能变成乘号乘法与除法的符号法则一样两数相除,同号得正,异号得负(≠0)