ПОМОГИТЕ ПОЖАЛУЙСТА!!!;Приведите подобные слагаемые: 4)5 4/9d-88+4 1/3d+79,8;
5)-66x+20y-17x+y;
6)8,2a-9b+11,7a-6b;
7)3/16c+7,3d-1/8c-9,4d;
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