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svetik13svetlanka
@svetik13svetlanka
July 2022
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помогите, пожалуйста
решите систему уравнений
0,3х-0,5у=1
0,5х+0,2у=5,8
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Answers & Comments
albinatekleeva
0,3х-0,5у=1
0,5х+0,2у=5,8
3x - 5y = 10 (*2) => 6x - 10y = 20 (1)
5x + 2y = 58 (*5) => 25x + 10y = 290 (2)
Ур-ние (2) + ур-ние (1) =>
(25x + 6x) + (10y - 10y) = 290 + 20
31x = 310 => x=10
3x - 5y = 10 => y= (3x - 10)/5 = (3*10 - 10)/5 = 4
x=10, y=4
2 votes
Thanks 2
Elchin9
0,3x-0,5y=1/*2
0,5x+0,2y=5,8/*5
0,6x-y=2
2,5+y=29
3,1x=31
x=10 y=4
1 votes
Thanks 1
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Answers & Comments
0,5х+0,2у=5,8
3x - 5y = 10 (*2) => 6x - 10y = 20 (1)
5x + 2y = 58 (*5) => 25x + 10y = 290 (2)
Ур-ние (2) + ур-ние (1) =>
(25x + 6x) + (10y - 10y) = 290 + 20
31x = 310 => x=10
3x - 5y = 10 => y= (3x - 10)/5 = (3*10 - 10)/5 = 4
x=10, y=4
0,5x+0,2y=5,8/*5
0,6x-y=2
2,5+y=29
3,1x=31
x=10 y=4