79у-(23у-15у), если у=15,309

Question

79у-(23у-15у), если у=15,309

Answer 1

79*15,309-(23*15,309-15*15,309)=1209,411-(352,107-229,653)=1209,411-122,454=1086,957=1087

Answer 2

79у-(23у-15у) = 79у - 8у = 71у

если у = 13, то 71у = 71 * 13 = 923

если у = 309, то 71у = 71 * 309 = 21939