Question

[1/15 + 1/35 + 1/63] * x = 1

Answer 1

             \(\left[\frac{1}{15}+\frac{1}{35}+\frac{1}{36}\right]\cdot x=1\)

                           \(\frac{31}{252}\cdot x=1\)

                                       \(x=1:\frac{31}{252}\)

                                           \(x=\frac{252}{31}\)

Answer 2

\(\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}\right)\times x=1\)

\(\Leftrightarrow\frac{1}{9}\times x=1\)

\(\Leftrightarrow x=1\div\frac{1}{9}\)

\(\Leftrightarrow x=9\)

Vậy x=9

_Chúc bạn học tốt_

Answer 3

\(\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}\right)\times x=1\)

\(\left(\frac{1}{3\times5}+\frac{1}{5\times7}+\frac{1}{7\times9}\right)\times x=1\)

\(\frac{1}{2}\times\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}\right)\times x=1\)

\(\frac{1}{2}\times\left(\frac{1}{3}-\frac{1}{9}\right)\times x=1\)

\(\frac{1}{2}\times\frac{2}{9}\times x=1\)

\(\frac{1}{9}\times x=1\)

\(x=1:\frac{1}{9}\)

\(x=9\)

Answer 4

( 1/15 + 1/35 + 1/63 ) . x = 1

1/9 . x = 1

x = 1 : 1/9

x = 9

Vậy x = 9

Dấu '' . '' là nhân nha

Answer 5

\(\left[\frac{1}{15}+\frac{1}{35}+\frac{1}{63}\right].x=1\)

\(\Rightarrow\left[\frac{21}{315}+\frac{9}{315}+\frac{5}{315}\right]x=1\)

\(\Rightarrow\frac{1}{9}x=1\)

\(\Rightarrow x=1:\frac{1}{9}=9\)

vậy x = 9