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