不等式的基本性质 (1)对称性：a＞b⇔_______ (2)传递性：a＞b，b＞c⇒_______ (3)可加性：a＞b⇔____________ (4)可乘性：a＞b，c＞0⇒_______；a＞b，c＜0⇒_________. (5)加法法则：a＞b，c＞d⇒____________. (6)乘法法则：a＞b＞0，c＞d＞0⇒__________.

b＜a.

a＞c.

a＋c＞b＋c.

ac＞bc

ac＜bc

a＋c＞b＋d

ac＞bd