a, 5x – y=13 b, 23x +53y=109 c, 12 – 5y=21 05/07/2021 Bởi Samantha a, 5x – y=13 b, 23x +53y=109 c, 12 – 5y=21 d,12x+ 17y=41 e, 5(x+y)+2=3xy g, 2(x+y)=5xy c,3x+7=y(x-3)
Đáp án: `a)` ` 5x – y = 13` ` y = 5x -13` ` x ∈ R ; y = 5x -13` `b)` ` 23x + 53y = 109` ` => 53y = 109 – 23x` ` => y = (109-23x)/53` ` => x ∈ R ; y = …..` `c)` `12 – 5y = 21` ` > 5y = 33` ` => y = 33/5` `d)` ` 12x + 17y = 41` ` => 12x = 41 – 17y` ` => x =(41-17y)/12` Bình luận
Đáp án:
`a)`
` 5x – y = 13`
` y = 5x -13`
` x ∈ R ; y = 5x -13`
`b)`
` 23x + 53y = 109`
` => 53y = 109 – 23x`
` => y = (109-23x)/53`
` => x ∈ R ; y = …..`
`c)`
`12 – 5y = 21`
` > 5y = 33`
` => y = 33/5`
`d)`
` 12x + 17y = 41`
` => 12x = 41 – 17y`
` => x =(41-17y)/12`