Question

[Trần Khánh Ngọc]

[x-1]x3 =15

20: [x+1] -3=2

Answer 1

[Dang Tung]

\(\left(x-1\right).3=15\\ =>x-1=5\\ =>x=6\)

\(20:\left(x+1\right)-3=2\\ =>20:\left(x+1\right)=5\\ =>x+1=4\\ =>x=3\)

Answer 2

[Nguyễn Xuân Thành]

\(\left(x-1\right).3=15\)

\(x-1=15:3\)

\(x-1=5\)

\(x=5+1\)

\(x=6\)

Vậy \(x=6\)

\(20:\left(x+1\right)-3=2\)

\(\left(x+1\right)-3=20:2\)

\(\left(x+1\right)-3=10\)

\(x+1=10-3\)

\(x+1=7\)

\(x=7-1\)

\(x=6\)

Vậy \(x=6\)