a) 156 - ( x + 61 ) = 82
<=> x + 61 = 74
<=> x = 13
b ) x : ( 111 - 99 ) = 17 , 5
<=> x : 12 = 17 , 5
,=> x = 210
c) ( 509 + 355 ) : x = 840 : 35
<=> 864 : x = 24
,=> x = 36
a) 156 - ( x + 16 ) = 82 x : ( 111 - 99 ) = 17.5
x + 16 = 156 - 82 x : 12 = 17.5
x + 16 = 74 x = 17.5 x 12
x = 74 - 16 x = 210
x = 58 Vậy x = 210
Vậy x = 58
c) ( 509 + 355 ) : x = 840 : 35
864 : x = 840 : 35
864 : x = 24
x = 864 : 24
x = 36
Vậy x = 36
a)156-(x+61)=82
x+61=156-82
x+61=74
x=74-61
x=13. Vậy x = 13
b)x:(111-99)=17,5
x:12=17,5
x=17,5x12
x=210.Vay x = 210
c)(509+355):x=840:35
864:x=24
x=864:24
x=36.Vay x = 36
mk xog r , k mk
a/
\(156-\left(x+61\right)=82\)
\(x+61=156-82=74\)
\(x\) \(=74-61\)
\(x\) \(=13\)
b/
\(x\div\left(111-99\right)=17,5\)
\(x\div12\) \(=17,5\)
\(x\) \(=17,5\times12\)
\(x\) \(=210\)
c/
\(\left(509+355\right)\div x=840\div35\)
\(\left(509+355\right)\div x=24\)
\(864\div x\) \(=24\)
\(x=864\div24\)
\(x=36\)