Приведите подобные слагаемые:
1) -2,5а + 1,8а + 1,5а
2) 3,2б - 4,3 - 3,2б
3)1/2с + 1/3с + 1/6с
4) 1,9д - 4,2д + 3,1д
5) 7,2а - 5а - 1,3а
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