a) \(\left(3.x-12\right).3=27\)
\(\Rightarrow3x-12=27:3\)
\(\Rightarrow3x-12=9\)
\(\Rightarrow3x=9+12\)
\(\Rightarrow3x=21\)
\(\Rightarrow x=21:3\)
\(\Rightarrow x=7\)
b) \(7.\left(4.x\right)=14\)
\(\Rightarrow4.x=14:7\)
\(\Rightarrow4.x=2\)
\(\Rightarrow x=2:4\)
\(\Rightarrow x=\frac{1}{2}\)
\(\left(3.x-12\right).3=27\) \(7.\left(4.x\right)=14\)
\(3.x-12=27:3\) \(4.x=14:7\)
\(3.x-12=9\) \(4.x=2\)
\(3.x=9+12\) \(x=2:4\)
\(3.x=21\) \(x=\frac{1}{2}.\)
\(x=21:3\)
\(x=7.\)
(3.x-12).3=27
3.x-12=27:3
3.x-12=9
3.x=9+12
3.x=21
x=21:3
x=7
7.(4.x)=14
4.x=14:7
4.x=2
x=2:4
x=0.5
hai bn ơi câu cuối pahir là 4 chia 2 chứ sai r
(3.x-12).3=27 Câu 7.(4.x)=14 SAI ĐỀ
3.x-12 =27/3
3.x-12 =9
3.x =9+12
3.x =21
x =21/3
x =7
.(3*X-12)*3=27
(3*X-12)=27/3
3*X-12=9
3*X=9+12
3*X=21
X=21/3
X=7
VẬY X=7
.7*(4*X) = 14
4*X=14/7
4*X=2
X=2/4
X=1/2
VẬY X=1/2
a,(3.x-12).3=27
=>3.x-12=27/3
=>3.x-12=9
=>3.x=9+12
=>3.x=21
=>x=21/3
=>x=7
b,7.(4.x)=14
=>4.x=14/7
=>4.x=2
=>x=2/4
=>x=1/2