1)3,28+(7,12+а);
2) b+4,5+0,8b;
3)7,4c+2,6-c-5,2c;
4)d+2,7+1,9d+4,5;
5)12x*0,05y*2,5;
6) 36k*0,2k²
Надо спростить примери. Помогите
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