Помогите,задание,раскройте скобки:1)3/7b(-14t-7/9y+2 1/3c)
2)-1,2xy(5m-6c+1/6t-5/6)
3)0,3mn(1,5-6bc+7b-10c)
2)-1,2xy(5m-6c+1/6t-5/6)
3)0,3mn(1,5-6bc+7b-10c)
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1)3/7b(-14t-7/9y+2 1/3c)=-6bt-1/3by+BC;////2)-1,2xy(5m-6c+1/6t-5/6)=-6xym+7 1/5xyc-1/5xyt+xy;////3)0,3mn(1,5-6bc+7b-10c)=0,45mn-1,8mnbc+2,1mnb-3mnc