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a) 25 - 3x = 13
3x = 25 - 13
3x = 12
x = 12 : 3
x = 4
b) 13 + 3(130 - 3x) = 313
3(130 - 3x) = 313 - 13
3(130 - 3x) = 300
130 - 3x = 300 : 3
130 - 3x = 100
3x = 130 - 100
3x = 30
x = 30 : 3
x = 10
25-3x=13
3x=25-13
3x=12
x=12:3
x=4
b, 13+3.(130-3x) =313
3.(130-3x)=313-13
3.(130-3x)=300
130-3x=300:3
130-3x=100
3x=130-100
3x=30
x=30:3
x=10
c, (17-x).125=1500
17-x=1500:125
17-x=12
x=17-12
x=5
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a , 25-3x=13
3x=25-13
3x=12
x =12/3
x = 4
b , 13+3{130-3x}=313
3{130-3x}=313-13
130*3-9x=300
390-9x =300
9x =390-300
x=90/9
x= 10
c. {17-x}*125=1500
17-x =1500/125
17-x = 12
x =17-12
x = 5
\(a.25-3x=13\)
\(3x=25-13\)
\(3x=12\)
\(x=4\)
\(b.13+3\left(130-3x\right)=313\)
\(3\left(130-3x\right)=313-13\)
\(3\left(130-3x\right)=300\)
\(130-3x=100\)
\(3x=130-100\)
\(3x=30\)
\(x=10\)
\(c.\left(17-x\right).125=1500\)
\(\left(17-x\right)=1500:125\)
\(17-x=12\)
\(x=17-12\)
\(x=5\)
a . 25 - 3x = 13
=> 3x = 12
=> x = 4
Vậy x= 4
b . 13 + 3 .( 130 - 3x ) = 313
=> 3 ( 130 - 3x ) = 300
=> 130 - 3x = 100
=> 3x = 30
=> x = 10
Vậy x = 10
c. ( 17 - x ) . 125 = 1500
=> 17 - x = 12
=> x = 5
Vậy x = 5