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алина3391
@алина3391
September 2021
2
8
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помогите пожалуйста всю голову сломала не знаю как решить , буду очень благодарна , если можно с объяснением.
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evvoronina1
(5 5/9 - 6,8) : ( 2 13/30 - 2 1/12) • 3,6 =
1) 5 5/9 - 6,8 = 50/9 - 68/100 =
= 50/9 - 17/25 =1250/225 - 153/225=
= 1097/225
2) 2 13/30 - 2 1/12 = 73/30 - 25/12 =
= 146/60 - 125/60 = 21/60 = 7/20
3) 1097/225 : 7/20=(1097•20)/(225•7)
=
= (1097•4)/(45•7) = 4388/315
4) 4388/315 • 3,6=4388 /315 • 36/100=
= 4388/315 • 9/25=
= (1097•4•9)/(315•25) =
=(4388 • 4)/(35•25)= 4388/875 = 5 13/875
=
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laska06464
5 5/9-6,8=5 5/9-6 8/10=5 5/9-6 4/5=5 25/45-6 36/45=-1 11/45
2 13/30-
2 1/12=2 26/60-2 5/60=21/60=7/20
1 11/45:7/20=56/45*20/7=32/9
32/9*36/10=64/5=12 4/5=12,8
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Answers & Comments
1) 5 5/9 - 6,8 = 50/9 - 68/100 =
= 50/9 - 17/25 =1250/225 - 153/225=
= 1097/225
2) 2 13/30 - 2 1/12 = 73/30 - 25/12 =
= 146/60 - 125/60 = 21/60 = 7/20
3) 1097/225 : 7/20=(1097•20)/(225•7)
=
= (1097•4)/(45•7) = 4388/315
4) 4388/315 • 3,6=4388 /315 • 36/100=
= 4388/315 • 9/25=
= (1097•4•9)/(315•25) =
=(4388 • 4)/(35•25)= 4388/875 = 5 13/875
=
2 13/30-
2 1/12=2 26/60-2 5/60=21/60=7/20
1 11/45:7/20=56/45*20/7=32/9
32/9*36/10=64/5=12 4/5=12,8