(5m-1)*(m+1)-5m*(m+2) = (5m²-5m+m-1) - 5m²+10m = -6m²-6m+5
при m= - 1 5/6; -6*(-1 5/6) + 5 = 15
Удачи!
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(5m-1)*(m+1)-5m*(m+2) = (5m²-5m+m-1) - 5m²+10m = -6m²-6m+5
при m= - 1 5/6; -6*(-1 5/6) + 5 = 15
Удачи!
Подставляем вместо m -1 5/6
-6*(-1 5/6)-6*(-1 5/6)+5=15
Ответ: 15