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\(3x+2x=35\)
\(\Rightarrow x\cdot\left(3+2\right)=35\)
\(\Rightarrow x\cdot5=35\)
\(\Rightarrow x=35:5\)
\(\Rightarrow x=7\)
Vậy: x = 7
\(35-\left[\left(2x-3\right)^2:7\right]=28\)
\(\Rightarrow\left[\left(2x-3\right)^2:7\right]=35-28\)
\(\Rightarrow\left(2x-3\right)^2:7=7\)
\(\Rightarrow\left(2x-3\right)^2=1\)
\(\Rightarrow2x-3=\pm1\)
\(\Rightarrow x=2\) hay \(x=1\)
35 - [(2\(x\) - 3)2:7 ] = 28
(2\(x-3\))2 : 7 = 35 - 28
(2\(x\) - 3)2 : 7 = 7
(2\(x\) - 3)2 = 7 \(\times\) 7
(2\(x-3\))2 = 72
\(\left[{}\begin{matrix}2x-3=-7\\2x-3=7\end{matrix}\right.\)
\(\left[{}\begin{matrix}2x=-7+3\\2x=7+3\end{matrix}\right.\)
\(\left[{}\begin{matrix}2x=-4\\2x=10\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=-2\\x=5\end{matrix}\right.\)
Vậy \(x\in\) {-2; 5}
2x - 7m + y = (2x + y) - 7m
Ta có: m = 2 => 7m = 7.2 = 14
Ta có: (2x + y) - 14
Thế 2x + y = 35 vào (2x + y) - 14 (hay 7m)
Ta được: 35 - 14 = 21
Vậy 2x - 7m + y = 21 khi 2x + y = 35 và m = 2
-2x - 11 chia hết cho 3x + 2
=> -3(-2x - 11) chia hết cho 3x + 2
=> 6x + 33 chia hết cho 3x + 2
=> 6x + 4 + 29 chia hết cho 3x + 2
=> 2(3x + 2) + 29 chia hết cho 3x + 2
=> 29 chia hết cho 3x + 2
a) \(\frac{3}{7}x-\frac{1}{35}=\frac{3}{5}\)
\(\frac{3}{7}x=\frac{3}{5}+\frac{1}{35}\)
\(\frac{3}{7}x=\frac{22}{35}\)
\(x=\frac{49}{35}=1,4\)
b) \(1,5-x:\frac{1}{2}=\frac{1}{4}\)
\(x:\frac{1}{2}=1,5-\frac{1}{4}\)
\(x:\frac{1}{2}=\frac{5}{4}\)
\(x=\frac{5}{4}.\frac{1}{2}\)
\(x=\frac{5}{8}\)
Vậy ..
\(\left(2x-\dfrac{3}{4}\right)^2=\left(3-x\right)^2\)
\(\Rightarrow2x-\dfrac{3}{4}=3-x\)
\(3x=3\dfrac{3}{4}\)
\(x=\dfrac{5}{4}\)
a, 3x + 7 = 2x - 11
\(\Rightarrow3x-2x=-11-7\)
\(\Rightarrow x=-18\)
b, 4 - x = 2x + 16
\(\Rightarrow-x-2x=16-4\)
\(\Rightarrow-3x=12\)
\(\Rightarrow x=\frac{12}{-3}\)
\(\Rightarrow x=-4\)
c, -(x - 4) = x + 8
\(\Rightarrow-x+4=x+8\)
\(\Rightarrow-2x=4\)
\(\Rightarrow x=\frac{4}{-2}\)
\(\Rightarrow x=-2\)
3x+2x=35
=>5x=35
=>x=7
You're really good, what grade are you in?