一个加数是-1.8
2.8-（-1.8）
=2.8+1.8
=4.6
答：另一个加数是4.6
一个加数是1.8的相反数,和为2.8,则另一个加数是 .
一个加数是1.8的相反数,和为2.8,则另一个加数是 .
数学人气：866 ℃时间：2020-02-03 11:25:21
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