a, \(\left(x-21\times13\right):11=30\)
\(\Rightarrow x-273=30\times11=330\)
\(\Rightarrow x=330+273=603\)
b, \(\left(627-138\right):\left(x:2\right)=163\)
\(\Rightarrow489:\left(x:2\right)=163\)
\(\Rightarrow x:2=489:163=3\Rightarrow x=2\times3=6\)
a, ( x - 21 . 13 ) : 11 = 30
( x - 273 ) = 30 . 11
x - 273 = 330
x = 330 + 273
x = 603
Vậy x = 603
b, ( 627 - 138 ) : ( x : 2 ) = 163
489 : ( x : 2 ) = 163
x : 2 = 489 : 163
x : 2 = 3
x = 3 . 2
x = 6
Vậy x = 6
