Question

( 1/2 + 1/6 + 1/12 + 1/20 ) × ( 20 - x ) = 4

Tìm x

Answer 1

\(\frac{4}{5}\times\left(20-x\right)=4\)

\(20-x=4:\frac{4}{5}\)

\(20-x=5\)                        Mình Chúc Các Bn Học Giỏi !!!!!!!!!!!!!!!!!!!

\(x=20-5\)

\(x=15\)

Answer 2

(1/2+1/6+1/12+1/20) x (20 - x) =4

4/5 x (20-x)= 4

20-x=4:4/5

20-x=5

x=15

Answer 3

 (\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}\)) x (20-x) = 4

\(\frac{4}{5}\) x (20-x) = 4

                 20-x=4:\(\frac{4}{5}\)

                 20-x=5

                      x=20-5

                      x=15