Question

tim x:  X x 3/5 + X x 3/7 = 31/70

Answer 1

X x 3/5+ Xx 3/7=31/70

=>X x (3/5+3/7)=31/70

=>X x 36/35=31/70

=>X=31/70:36/35

=>X=31/72

Answer 2

X x 3/5+ Xx 3/7=31/70

=>X x (3/5+3/7)=31/70

=>X x 36/35=31/70

=>X=31/70:36/35

=>X=31/72

Answer 3

X x 3/5+ Xx 3/7=31/70

=>X x (3/5+3/7)=31/70

=>X x 36/35=31/70

=>X=31/70:36/35

=>X=31/72

Answer 4

X x 3/5+ Xx 3/7=31/70

=>X x (3/5+3/7)=31/70

=>X x 36/35=31/70

=>X=31/70:36/35

=>X=31/72

Answer 5

\(Xx\frac{3}{5}+Xx\frac{3}{7}=\frac{31}{70}\)

\(Xx\left(\frac{3}{5}+\frac{3}{7}\right)=\frac{31}{70}\)

\(Xx\frac{36}{35}=\frac{31}{70}\)

         \(X=\frac{31}{70}:\frac{36}{35}\)

\(X=\frac{31}{72}\)

Answer 6

31/72

Answer 7

\(\text{Ta có: }\frac{3}{5}x+\frac{3}{7}x=\frac{31}{70}\)

\(\Rightarrow\left(\frac{3}{5}+\frac{3}{7}\right)x=\frac{31}{70}\)

\(\Rightarrow\frac{36}{35}x=\frac{31}{70}\)

\(\Rightarrow x=\frac{31}{70}:\frac{36}{35}\)

\(\Rightarrow x=\frac{31}{72}\)

Answer 8

31/72