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\(15.x< 750\)
\(x=750:15\)
\(x=50\)
Vậy x bằng các số nhỏ hơn 50.
\(3.\left(x-12\right)=36\)
\(x-12=36:3\)
\(x-12=12\)
\(x=12+12\)
\(x=24\)
\(\left(x+251\right)-301=56\)
\(x-251=56+301\)
\(x-251=357\)
\(x=357+251\)
\(x=608\)
\(152+\left(x+231\right):2=358\)
\(\left(x+231\right):2=358-152\)
\(\left(x+231\right):2=206\)
\(x+231=206.2\)
\(x+231=412\)
\(x=412-231\)
\(x=181\)
k nhé mình nhanh
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a) \(2x-138=2^3.3^2\)
\(\Rightarrow2x-138=72\)
\(\Rightarrow2x=210\)
\(\Rightarrow x=105\)
b) \(231-\left(x-6\right)=1339:13\)
\(\Rightarrow231-\left(x-6\right)=103\)
\(\Rightarrow x-6=110\)
\(\Rightarrow x=116\)
a) \(2.x-138=2^3.3^2\)
\(2.x-138=8.9\)
\(2.x-138=72\)
\(2x=72+138\)
\(2x=210\)
\(x=210:2\)
\(x=105\)
\(231-\left(x-6\right)=1339:13\)
\(231-\left(x-6\right)=103\)
\(x-6=231-103\)
\(x-6=128\)
\(x=128+6\)
\(x=134\)
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a) \(2x-13=2^3.3^2\)
=> \(2x-13=8.9=27\)
=> \(2x=27-13=14\)
=> \(x=7\)
b) \(231-\left(x-6\right)=1339:13=103\)
=> \(x-6=231-103=128\)
=> \(x=6+218=224\)
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a) 5.x< 40
=> x = 0 ; 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7
b)5(x-20)=35
= ( x - 20 ) = 35 : 5 = 7
( x - 20 ) = 7
=>x = 20 + 7 = 27
c) (x-125)-130=5
( x - 125 ) = 5 + 130
( x - 125 ) = 135
=>x = 135 + 125
= 360
d)215+(x+21):2=358
( x + 21 ) : 2 = 358 - 215
( x +2 1 ) : 2 = 170
( x + 21 ) = 170 x 2 = 340
( x + 21 ) = 340 - 21 = 319
![](https://rs.olm.vn/images/avt/0.png?1311)
3(x-12)=36
=>x-12=36:3
=>x-12=12
=>x=12+12
=>x=24
tíc mình nha