Упростите выражение: а) 4m-6m-3m+7+m ;
б) -8(k-3)+4(k-2)-2(3k+1);
в) 5/9(3,6a-3 3/5b)-3,5(4/7a-00,2b)
Решите уравнение:
0,6(y-3)-0,5(y-1)=1,5
Найдите корень уравнения:
(2,5y-4)(6y+1,8)=0
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