[61+(53-x)].17=1785
[61+(53-x)]=1785:17=105
61+(53-x)=105
53-x=105-61
53-x=44
x=44+55
x=99
vay x=99
[61+(53-x)].17=1785
=>[61+(53-x)]=1785:17
=>114 -x=105
=>x=114-105
=>x=9
\(\left[61+\left(53-x\right)\right].17=1785\)
\(\Rightarrow\left[61+\left(53-x\right)\right]=1785:17\)
\(\Rightarrow\left[61+\left(53-x\right)\right]=105\)
\(\Rightarrow53-x=105-61\)
\(\Rightarrow53-x=44\)
\(\Rightarrow x=53-44\)
Vậy \(x=9\)
[ 61 + ( 53 - x ) ] x 17 = 1785
61 + ( 53 - x ) = 1785 : 17
61 + ( 53 - x ) = 105
53 - x = 105 - 61
53 - x = 44
x = 53 - 44
x = 9
Vậy x = 9