Вправа 201 - 300 » 265

265. Виконай ділення. a) 4/7 : 2/21 = (4•21)/(7•2) = 2 • 3 = 6; б) –15 : 5/7 = (-15•7)/5 = –21; в) 3,5/4 : (-7)/16 = (3,5•16)/(4•(-7)) = –0,5 • 4 = –2; г) 5x/3y : 10x/6y = (5x•6y)/(3y•10x) = 1; ґ) 3a/〖8b〗^2 : 1/〖4b〗^2 = 〖3a•4b〗^2/〖8b〗^2 = 3a/2; д) 〖4m〗^2/n^3 : (〖12m〗^3•)/n^4 = (〖4m〗^2•n^4 )/(n^3• 〖12m〗^3 ) = n/3m.