(x - 21 x 13) : 11 + 39 = 50
(x - 273) : 11 = 50 - 39
(x - 273) : 11 = 11
x - 273 = 11 x 11
x - 273 = 121
x = 121 + 273
x = 394
vậy x = 394
[ x - 21 x 13 ] : 11 + 39 = 50
[ x - 273 ] : 11 = 50 - 39
[x - 273 ] : 11 = 11
x - 273 = 11 x 11
x - 273 = 121
x = 121 + 273
x = 394
\(\left(x-21\cdot13\right):11+39=50\)
\(\frac{x}{11}-\frac{34}{11}+39=50\)
\(\frac{x}{11}=\frac{155}{11}\)
\(x=155\)
(x-21x13):11+39 = 50
(x-21x13):11 = 50 - 39
(x-21x13):11 = 11
x-21x13 = 11 x 11
x-21x13 = 121
x-21 = 121 : 13
x-21 = 121/13
x = 121/13 +21
x = 290/13
Mik lộn:
(x - 21 x 13) : 11 + 39 = 50
(x - 273) : 11 + 39 = 50
(x - 273 ) : 11 = 50 - 39
(x - 273) : 11 = 11
x - 273 = 11 x 11
x - 273 = 121
x = 121 + 273
x = 394