математика 5 класс: помогите упростить выражения: 1)(7,2к+1,9к)+(33,5х-4,7х); 2) (9,82у-5,82у)+(37а-0,75а); 3) (12,2а-8,6а)+(9,15-7,035); 4) 8,5х+(4,75-3,37)+9,3х?
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1)(7,2к+1,9к)+(33,5х-4,7х)=9,1к+28,8х;2) (9,82у-5,82у)+(37а-0,75а)=4у+36,25а;
3) (12,2а-8,6а)+(9,15-7,035)=3,6а+2,115;
4)8,5х+(4,75-3,37)+9,3х=17,8х+1,38