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Se convierte los números mixtos a fraccionarios y se ase la multiplicación
19) 2(2/9)*4(4/5)
20/9 * 24/5 = 480/45 = 32/3
21) 6(2/3)*5(2/11)
20/3 * 57/11 = 1140/33= 380/11
23) 8(8/9)*3(1/10)
80/9 * 31/10 = 2480/90= 248/9