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比大小 ----a-------0-----b---- (1)a+b ( )0 (2)比大小----a-------0-----b----(1)a+b ( )0(2)a+(-b) ( )0(3)(-a)+b ( )0(4)(-a)+(-b) ( )0(5)|a|+b ()0(6)|a|+|b| ()0(7)(-|a|)+(-b) ()0
比大小 ----a-------0-----b---- (1)a+b ( )0 (2)
比大小
----a-------0-----b----
(1)a+b ( )0
(2)a+(-b) ( )0
(3)(-a)+b ( )0
(4)(-a)+(-b) ( )0
(5)|a|+b ()0
(6)|a|+|b| ()0
(7)(-|a|)+(-b) ()0
比大小 ----a-------0-----b---- (1)a+b ( )0 (2)比大小----a-------0-----b----(1)a+b ( )0(2)a+(-b) ( )0(3)(-a)+b ( )0(4)(-a)+(-b) ( )0(5)|a|+b ()0(6)|a|+|b| ()0(7)(-|a|)+(-b) ()0