Question

[Lương Tuấn Hưng]

a/ 3 + x = 7

b/ -3x + 5 = -22

c/ -3.|x-1| = -9

giải hộ mik 3 câu

ai nhanh mik tik mik cần gấp lmws

Answer 1

[💋Amanda💋]

a, 3+x=7

=>x=4

b, -3x+5=-22

=>-3x=-27

=>x=9

c, -3./x-1/=-9

/x-1/=3

th1: x-1=3 th2: x-1=-3

=>x=4 =>x=-2

Answer 2

[Học dốt :)]

\(a,3+x=7\)

\(x=7-3\)

\(x=4\)

Vậy \(x=4.\)

\(b,-3x+5=-22\)

\(-3x=-22-5\)

\(-3x=-27\)

\(x=\left(-27\right)\div\left(-3\right)\)

\(x=9\)

Vậy \(x=9.\)

\(c,-3\left|x-1\right|=-9\)

\(\left|x-1\right|=\left(-9\right)\div\left(-3\right)\)

\(\left|x-1\right|=3\)

\(\Rightarrow\left[{}\begin{matrix}x-1=3\\x-1=-3\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=4\\x=-2\end{matrix}\right.\)

Vậy \(x\in\left\{4;-2\right\}\)