tìm x : 38 + x = 123
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`123-5(x+4)=38`
`5x-20=123-38`
`5x-20=85`
`5x=85+20`
`5x=105`
`x=105:5`
`x=21`
123-5.(x+4)=38
5x-20=123-38
5x-20=85
5x=85+20
5x=105
x=105:5
x=21
a) x-12=-15
x=-15+12
x=-3
b) 123-5(x+4)=38
5(x+4)=123-38
5(x+4)=85
x+4=85:5=17
x=17-4
x=13
\(a.x-12=-15\) \(b.123-5.\left(x+4\right)=38\)
\(x=\left(-15\right)+12\) \(5.\left(x+4\right)=123-38\)
\(x=-3\) \(5.\left(x+4\right)=85\)
\(x+4=85:5=17\)
\(x=17-4=13\)
123 - 5 x ( x - 4 ) = 38
5 x ( x - 4 ) =123 - 38
5 x ( x - 4 ) = 85
( x - 4 ) = 85 : 5
( x - 4 ) = 17
x = 17 + 4
x = 21
vậy x = 21
123 - 5 x ( x + 4 ) = 38
5 x ( x + 4 ) = 123 - 38
5 x ( x + 4 ) = 85
( x + 4 ) = 85 : 5
x + 4 = 17
x = 17 - 4
x = 13
Vậy x = 13
123 – 5(x + 4) = 38
5(x + 4) = 123 – 38
5(x + 4) = 85
x + 4 = 85 : 5
x + 4 = 17
x = 17 – 4
x = 13
Vậy x = 13
a) \(123-5\left(x.4\right)=38\)
\(5\left(x.4\right)=123-38\)
\(5\left(x.4\right)=85\)
\(x.4=85:5\)
\(x.4=17\)
\(x=17:4\)
\(\Rightarrow x=4,25\)
a)123-5(x.4)=38
5(x.4)=123-38
5(x.4)=85
x.4=85:5
x.4=17
x=?
123 - 5.(x + 4) = 38
=> 5.(x + 4) = 123 - 38
=> 5.(x + 4) = 85
=> x + 4 = 85 : 5
=> x + 4 = 17
=> x = 17 - 4
=> x = 13
=> 5(x + 4) = 123 - 38
=> 5(x + 4) = 85
=> x + 4 = 85:5
=> x + 4 = 17
=> x = 17 - 4
=> x = 13
123 - 5 . ( x + 4 ) = 38
5 . ( x + 4 ) = 123 - 38
5 . ( x + 4 ) = 85
x + 4 = 85 : 5
x + 4 = 17
x = 17 - 4
x = 13
Nhớ tick cho mik nha !!!
123 - 5(x + 4) = 38
=> 5(x + 4) = 85
=> x + 4 = 17
=> x = 13
vậy_
(3x - 24).73 = 2.7
=> (3x - 24).73 = 14
=> 3x - 24 = 1022
=> 3x = 1046
=> x = 1046/3
x = 123- 38
x = 85
\(x=123-38=85\)
k mk nhé