Ответ:2.8) 2 17\36
2.9) -19\40
3.1) -1.48+ 15.2+ 11.34= 25.06
3.2) -3 2\3+ -4 1\5 + 3 1\4= 4 37\60
3.3) -14.58+ 18.8+ 11.18+ -15.4= 29.16
Пошаговое объяснение:
№2
8)
5 2/9 + (-2 3/4) = 5 2/9 - 2 3/4 = 5 8/36 - 2 27/36 = 4 44/36 - 2 27/36 = 2 17/36
9)
-5 3/8 + 4 9/10 = -5 15/40 + 4 36/40 = -4 55/40 + 4 36/40 = -19/40
№3
1)
(-1,48 + 15,2) + (-11,34) = 13,72 - 11,34 = 2,38
2)
3 1/4 + (-3 2/3 + (-4 1/5)) = 3 1/4 + (-3 2/3 - 4 1/5) = 3 15/60 + (-3 40/60 - 4 12/60) = 3 15/60 + (-7 52/60) = 3 15/60 - 7 52/60 = -4 37/60
3)
(-14,58 + 18,8) + (11,18 + (-15,4) = 4,22 + (11,18 - 15,4) = 4,22 + (-4,22) = 4,22 - 4,22 = 0
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Answers & Comments
Ответ:2.8) 2 17\36
2.9) -19\40
3.1) -1.48+ 15.2+ 11.34= 25.06
3.2) -3 2\3+ -4 1\5 + 3 1\4= 4 37\60
3.3) -14.58+ 18.8+ 11.18+ -15.4= 29.16
Пошаговое объяснение:
№2
8)
5 2/9 + (-2 3/4) = 5 2/9 - 2 3/4 = 5 8/36 - 2 27/36 = 4 44/36 - 2 27/36 = 2 17/36
9)
-5 3/8 + 4 9/10 = -5 15/40 + 4 36/40 = -4 55/40 + 4 36/40 = -19/40
№3
1)
(-1,48 + 15,2) + (-11,34) = 13,72 - 11,34 = 2,38
2)
3 1/4 + (-3 2/3 + (-4 1/5)) = 3 1/4 + (-3 2/3 - 4 1/5) = 3 15/60 + (-3 40/60 - 4 12/60) = 3 15/60 + (-7 52/60) = 3 15/60 - 7 52/60 = -4 37/60
3)
(-14,58 + 18,8) + (11,18 + (-15,4) = 4,22 + (11,18 - 15,4) = 4,22 + (-4,22) = 4,22 - 4,22 = 0