角的两边越长,度数越大.______.(判断对错)
角的大小于边的长短无关.
所以一个角的两边越长,这个角就越大.故是错误的.
故答案为:×.
设a,b∈R,则“a+b=1”是“4ab≤1”的[ ]
A.充分不必要条件
B.必要不充分条件
C.充要条件
D.既不充分也不必要条件
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