Question

[Nguyễn thị thu trang]

tìm x 

3/5 x X + X x 2 + 40 = 20 : 4//5 + 1/2 x 56

Answer 1

[Vũ Như Mai]

3/5 X + 2X + 40 = 53

 13/5 X              = 53 - 40

 13/5 X              = 13

    X                   = 13 : 13/5

    X                  = 5

Answer 2

[Die Devil]

\(\frac{3}{5}x+2x+40=53\)

\(\Leftrightarrow\frac{13}{5}x+40=53\)

\(\Leftrightarrow\frac{13}{5}x=53-40\)

\(\Leftrightarrow\frac{13}{5}x=13\)

\(\text{Mẫu chung:5}\)

\(\Leftrightarrow13.5x=13.5\)

\(65x=65\)

\(\Rightarrow x=1\)