Question

Tìm x biết

7/15x X+3/8x X=9

Answer 1

7/5 x X + 3/8 x X= 9

X x (7/5 +3/8)=9

X x 71/40 = 9

X             = 9:71/40

X             = 360/71

Answer 2

     \(\frac{7}{15}X+\frac{3}{8}X=9\)

     \(\left(\frac{7}{15}+\frac{3}{8}\right)X=9\) 

\(\left(\frac{56}{120}+\frac{45}{120}\right)X=9\)

                  \(\frac{101}{120}X=9\)

                          \(X=9:\frac{101}{120}\)

                          \(X=9x\frac{120}{101}\)

                          \(X=\frac{1080}{101}\)