Question

Tìm x, biết:

\(\left|x-3,5\right|-3,5=4\)

nhanh nhanh nha mn gấp lắm

Answer 1

\(\left|x-3,5\right|\) - 3,5 = 4

\(\left|x-3,5\right|\) = 4 + 3,5

\(\left|x-3,5\right|\) = 7,5

\(\Rightarrow\)x - 3,5 = 7,5 hoặc x - 3,5 = -7,5

\(\Rightarrow\)x = 11 hoặc x = -4

Answer 2

\(\left|x-3,5\right|-3,5=4\)

\(\left|x-3,5\right|=4+3,5\)

\(\left|x-3,5\right|=7,5\)

\(\Rightarrow\) \(x-3,5=\pm7,5\)

TH 1:

\(x-3,5=7,5\)

\(x=7,5+3,5\)

\(x=11\)

TH 2:

\(x-3,5=-7,5\)

\(x=-7,5+3,5\)

\(x=-4\)

Vậy x = 11 hoặc x = -4