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b) 8,26 × 19 + 81 × 8,26 = 156,94 + 669,06 = 826
c) 49,3 : 27 - 22,3 : 27 = 49 i 3/10 : 27 - 22 i 3/10 : 27 = 493/10 * 1/27 - 223/10 * 1/27 = 493/270 - 223/270 = 270/270 = 1