Question

Найдите значение суммы 1) -9,25+(-3 1/5) 2) -72+3 5/8+(-0,75) 3) 15+(-9,46)+(-23/50) 4) -83,4+(-19 2/3)+(-4/15)

Answer 1

1)
-9,25+(-3 1/5) = -9 1/4 - 3 1/5 = -9 5/20 - 3 4/20 = - 12 9/20  (или -12,45),

2)
-72+3 5/8+(-0,75) = -72 + 3 5/8 - 3/4 =
= -72 + 3 5/8 - 6/8 = -72 + 2 7/8 = - 69 1/8,

3)
15+(-9,46)+(-23/50) = 15 - 9 23/50 - 23/50 = 15 - 9 46/50 = 5 4/50 = 5 2/25  (или 5,08),

4)
-83,4+(-19 2/3)+(-4/15) = -83,4 - 19 10/15 - 4/15 = -83 2/5 - 19 14/15 = 
= -83 6/15 - 19 14/15 = -102 20/15 = -103 5/15 = -103 1/3

Answer 2

1) -9,25+(-3 1/5)= -9,25+(-16/5)= -9,25+(-3,2)= -12,45=
= -12целых45/100
ответ: -12 45/100

2) -72+3 5/8+(-0,75)= -72+29/8+(-0,75)= -72+3,625+(-0,75)= -68,375+(-0,75)= -69 целых 125/1000
ответ: -69 целых 125/1000

3) 15+(-9,46)+(-23/50)=5,54+(-23/50)=5,54+(-0,46)=
=5 целых 8/100
ответ: 5 целых 8/100

4) -83,4+(-19 2/3)+(-4/15)= -83,4+(-59/3)+(-4/15)= -834/10+(-59/3)+(-4/15)= -834/10^(3)+(-59/3^(10))+(-4/15)=
= -2502/30+(-590/30)+(-4/15)= -3092/30+(-4/15)= -3092/30+(-4/15^(2))= -3092/30+(-8/30)= -3100/30= -620/6=
= -310/3
ответ: -310/3