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đề như z ak bn!
a)* 3x =26
=> x = 26/3
* 3x = 6
=> x = 2
b) \(x:4\times\frac{1}{3}=2,5\)
\(x\times\frac{1}{4}\times\frac{1}{3}=2,5\)
\(x\times\frac{1}{12}=2,5\)
\(x=2,5:\frac{1}{12}\)
\(x=30\)
c) \(\frac{3}{4x}=\frac{1}{2}=\frac{3}{6}\)
\(\Rightarrow\frac{3}{4x}=\frac{3}{6}\)
\(\Rightarrow4x=6\)
\(x=6:4\)
\(x=\frac{3}{2}\)
nếu như đề mk viết sai thì nhắn lại cho mk, mk sửa nha!
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a, 2x + 27 = -11
=> 2x = -11 - 27
=> 2x = -38
=> x = -38 : 2
=> x = -19
vậy___
b, 3x + 26 = 6
=> 3x = 6 - 26
=> 3x = -20
=> x = -20/3
vậy___
c, \(x\div4\frac{1}{2}=2,5\)
\(\Rightarrow x\div4,5=2,5\)
\(\Rightarrow x=4,5\cdot2,5\)
\(\Rightarrow x=11,25\)
vậy___
\(\frac{3}{4x}=\frac{1}{2}\) đk: x khác 0
\(\Rightarrow\frac{3}{4x}=\frac{3}{6}\)
=> 4x = 6
=> x = 4/6 = 2/3
vậy___
3/8+9/5=87/40
2-5/6=7/6
5/7-4/9=17/63
7/8+3/4=13/8
??