Розділ 1. РАЦІОНАЛЬНІ ВИРАЗИ » 6.3

6.3 Спростіть вираз: 1) 7b/12a : (21b^2)/16a = (7b • 16a)/(12 • 21b^2 ) = 4a/9b; 3) 9b/14a : (5b^2)/(21a^2 ) = (9b • 21a^2)/(14a • 5b^2 ) = 27a/10b; 2) 15/(2n^2 ) : 3m/8n = (15 • 8n)/(2n^2 • 3m) = 20/nm; 4) –(3x^2)/a : (6x^3)/a^2 = –(3x^2 •〖 a〗^2)/(a • 6x^3 ) = –a/2x; 5) 14x2 : 7x/a = (14x^2 • a)/7x = 2xa/1 = 2xa; 6) (8x^2)/7a : (–2x2) = (8x^3 • 1)/(7a • (-2x^2)) = –4x/7a; 7) –(12a^2)/b : (16a2) = –(12a^2 • 1)/(b • 16a^2 ) = –3/4b; 8) –40ma5 : (–(8m^2)/a) = (40ma^5• a)/(8m^2 ) = (5a^6)/m.