a) ( x + 216 ) : 61 + 1 = 202
( x + 216 ) : 61 = 201
( x + 216 ) = 12261
x = 12045
b) 1818 : ( 6x - 37 ) + 1 = 19
1818 : ( 6x - 37 ) = 18
( 6x - 37 ) = 101
6x = 138
x = 23
c) ( x : 23 + 45 ) x 67 + 3 = 8914
( x : 23 + 45 ) x 67 = 8911
x : 23 + 45 = 133
x : 23 = 88
x = 2024
(x + 216) : 61 + 1 = 202
=> (x + 216) : 61 = 201
=> x + 216 = 12261
=> x = 12045
vậy_
1818 : (6x - 37) + 1 = 19
=> 1818 : (6x - 37) = 18
=> 6x - 37 = 101
=> 6x = 138
=> x = 23
vậy_
(x : 23 + 45) x 67 + 3 = 8914
=> (x : 23 + 45) x 67 = 8911
=> x : 23 + 45 = 133
=>x : 23 = 88
=> x = 2024
vậy_
\(a.\left(x+216\right):61+1=202.\)
\(\Leftrightarrow\left(x+216\right):6=201\)
\(\Leftrightarrow x+216=1206\)
\(\Rightarrow x=990\)
\(b.1818:\left(6x-37\right)+1=19.\)
\(\Leftrightarrow1818:\left(6x-37\right)=18\)
\(\Leftrightarrow6x-37=101\)
\(\Leftrightarrow6x=138\)
\(\Rightarrow x=23\)
\(c.\left(x:23+45\right)\times67+3=8914\)
\(\Leftrightarrow\left(x:23+45\right)\times67=8911\)
\(\Leftrightarrow x:23+45=133\)
\(\Leftrightarrow x:23=88\)
\(\Rightarrow x=2024\)