Упростите выражение и найдите его значение: -0,5х(1-3n)+4x(0,2n-0,1_-(0,1 - 0,7n)Если n = 0,21;
(3m-4n)k-m(6n+5k)-(nk-6mn),если m= -1, k= -3,5, n=4?
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