Question

2x+40%x=-2,5 tìm x ( mình cần gấp)

Answer 1

2x + 40%x = -2,5

=> 2x + 2/5x = -1/4

=> x(2 + 2/5) = -1/4

=> 12/5x        = -1/4

=>        x        = -1/4 : 12/5

=>        x        = -5/48

Answer 2

\(2x-40\%x=-2,5\)

\(\Rightarrow2x-\frac{2}{5}x=-\frac{5}{2}\)

\(\Rightarrow x\left(2-\frac{2}{5}\right)=-\frac{5}{2}\)

\(\frac{\Rightarrow8}{5}x=-\frac{5}{2}\)

\(\Rightarrow x=-\frac{5}{2}:\left(-\frac{8}{5}\right)\)

\(\Rightarrow x=\frac{25}{16}\)

Answer 3

2x + 40%x = -2,5

2x + 0,4x = -2,5

x ( 2 + 0,4 ) = -2,5

2,4x = -2,5

x = -2,5/2,4

=))

Answer 4

Mình chép đề sai rồi ,tham khảo bạn Xyz nhé

Answer 5

\(2x+40\%x=-2,5\)

\(2x+\frac{2}{5}x=-2,5\)

\(x\left(2+\frac{2}{5}\right)=-\frac{5}{2}\)

\(\frac{12}{5}x=-\frac{5}{2}\)

\(x=-\frac{5}{2}\text{ : }\frac{12}{5}\)

\(x=-\frac{25}{24}\)

Answer 6

\(2x+40\%=-2,5\)

\(\Leftrightarrow2x+0,4x=-2,5\)

\(\Leftrightarrow x.\left(2+0,4\right)=-2,5\)

\(\Leftrightarrow x.2,4=-2,5\)

\(\Leftrightarrow x=-2,5:2,4\)

\(\Leftrightarrow x=-\frac{2,5}{2,4}\)

Hông chắc nha !!!