Question

Tìm x biết ( 1/15 cộng 1/35 cộng 1/63)x x=1

Answer 1

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

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

\(\Rightarrow\frac{35}{315}\times x=1\)

\(\Rightarrow x=1\div\frac{35}{315}\)

\(\Rightarrow x=\frac{315}{35}\)

Answer 2

1/9.x=1

vậy x = 9