a) 3x - 13 = 5
3x = 18
x = 6
b) 218 + x =194
x = -24
c) 3(2x+1) = 33
2x+1 = 11
2x = 10
x=5
a. 125 : ( 3x - 13 ) = 25
=> 3x - 13 = 5
<=> 3x = 18
<=> x = 6
b. 541 + ( 218 + x ) = 735
<=> x = 735 - 541 - 218 = -24
c. 3( 2x + 1 ) - 19 = 14
<=> 6x + 3 - 19 = 14
<=> 6x = 30
<=> x = 5
a. 125 : ( 3x - 13 ) = 25
3x - 13 = 125 : 25
3x - 13 = 5
3x = 5 + 13
3x = 18
x = 18 : 3
x = 6.
Vậy x = 6.
b. 541 + ( 218 + x ) = 735
218 + x = 735 - 541
218 + x = 194
x = 194 - 218
x = -24.
Vậy x = -24
c. 3( 2x + 1 ) - 19 = 14
3(2x + 1 ) = 14 + 19
3(2x + 1 ) = 33
2x + 1 = 33 : 3
2x + 1 = 11
2x = 11 - 1
2x = 10
x = 10 : 2
x = 5
Vậy x = 5
# HOK TỐT #
a) 125:(3x-13)=25
<=> 3x-13=5
<=> 3x=18
<=> x=6
Vậy x=6
b) 541+(281+x)=735
<=> 822+x=735
<=> x=-87
c) 3(2x+1)-19=14
<=> 3(2x+1)=33
<=> 2x+1=11
<=> 2x=10
<=> x=5
a. 125 : ( 3x - 13 ) = 25
<=>3x-13=5
<=>3x=18
<=>x=6
Vậy x=6
b. 541 + ( 218 + x ) = 735
<=>541+218+x=735
<=>759+x=735
<=>x=-24
Vậy x=-24
c. 3( 2x + 1 ) - 19 = 14
<=>6x+3-19=14
<=>6x-16=14
<=>6x=30
<=>x=5
Vậy x=5
a. 125 : (3x-13) = 25
3x-13 = 125 :25
3x-13 = 5
3x= 5+13
3x= 18
x = 18 :3 =6
b. 541 + (218+x) = 735
541+218+x = 735
759 + x = 735
x = 735 - 759 = -24
c. 3(2x+1) -19 = 14
3(2x+1) = 19+14
3(2x+1) = 33
2x+1 = 33:3
2x+1= 11
2x= 11-1
2x= 10
x= 10:2 = 5
a,125:(3x-13)=25
3x-13=125:25
3x-13=5
3x=5+13
3x=18
x=18:3
x=6
b,541+(218+x)=735
218+x=735-541
218+x=194
x=194-218
x=-24
c,3(2x+1)-19=14
3(2x+1)=14+19
3(2x+1)=33
2x+1=33:3
2x+1=11
2x=11-1
2x=10
x=10:2
x=5
a. 125 : ( 3x - 13 ) = 25
=> ( 3x - 13) =125 : 25
=> (3x - 13) =5
=>3x =5+13
=>3x =18
=> x =6
b. 541 + ( 218 + x ) = 735
=>( 218 + x ) = 735 - 541
=> 218 + x =194
=> x =194 - 218
=> x =-24
c. 3( 2x + 1 ) - 19 = 14
=>3(2x+1) = 14 + 19
=> 3(2x+ 1) = 33
=>2x+1 = 11
=>2x = 10
=> x = 5
a ) \(125\div\left(3x-13\right)=25\)
\(\Leftrightarrow3x-13=125\div25\)
\(\Leftrightarrow3x-13=5\)
\(\Leftrightarrow3x=5+13\)
\(3x=18\)
\(\Leftrightarrow x=6\)
b ) \(541+\left(218-x\right)=735\)
\(218-x=735-541\)
\(218-x=194\)
\(x=218-194\)
\(x=24\)
c ) \(3\left(2x+1\right)-19=14\)
\(\Leftrightarrow3\left(2x+1\right)=33\)
\(\Leftrightarrow2x+1=11\)
\(\Leftrightarrow2x=10\)
\(\Leftrightarrow x=5\)