是英文的.在离散数学的课本里.还有关于suchthat的否是什么啊.1.Thereexista,bandcsuchthat(a*b)*c≠a*(b*c)2.Forallintegersaandb,thereexistintegersqandrsuchthatb=qa+r3.ifnisaninteger,n/(n+1)isnotanintege

Question

是英文的.在离散数学的课本里.还有关于such that 的否是什么啊.
1.There exist a,b and c such that (a*b)*c≠a*(b*c)
2.For all integers a and b,there exist integers q and r such that b=qa+r
3.if n is an integer,n/(n+1) is not an integer.
注意第三个的答案不是
n is an integer and n/(n+1) is an integer.
因为老师给我判错了

Answer 1

1.存在a,b和c 并且使(a*b)*c≠a*(b*c) ---
2.对于所有整数a和b,存在整数q和r 并且使b=qa+r ----
3.如果n是一个整数,n/(n+1) 就不是整数 ---