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Zlata110404
@Zlata110404
August 2022
1
5
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Найдите значение выражения:
1. 0,7 (0,2х-1)+0,7(0,4х-5) при х=2 1/3
2. 4 2/9(у-3)- 1 5/9(6-у) при у=0,9
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sedinalana
1. 0,7 (0,2х-1)+0,7(0,4х-5)=0,14x-0,7+0,28x-3,5=0,42x-4,2
при х=2 1/3
0,42*2 1/3-4,2=0,42*7/3-4,2=0,98-4,2=-3,22
2. 4 2/9(у-3)- 1 5/9(6-у) =4 2/9y-12 2/3-9 1/3+1 5/9y=5 7/9y-22
при у=0,9
5 7/9*0,9-22=52/9*0,9-22=5,2-22=-16,8
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Answers & Comments
при х=2 1/3
0,42*2 1/3-4,2=0,42*7/3-4,2=0,98-4,2=-3,22
2. 4 2/9(у-3)- 1 5/9(6-у) =4 2/9y-12 2/3-9 1/3+1 5/9y=5 7/9y-22
при у=0,9
5 7/9*0,9-22=52/9*0,9-22=5,2-22=-16,8