Question

tìm x :

1/3 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56 - 1/72 - 1/90 - 1/100 = x - 5/13

 

Answer 1

\(x=\frac{617}{1300}\)

Answer 2

\(x=\frac{617}{1300}\)

chúc học giỏi

Answer 3

trình bày ra dùm nha các bạn

Answer 4

X=\(\frac{617}{1300}\)

K nha các ban

Answer 5

trình bày ra dùm lun đi

Answer 6

Ta có : \(\frac{1}{3}-\frac{1}{12}-\frac{1}{20}-\frac{1}{30}-.....-\frac{1}{72}-\frac{1}{90}-\frac{1}{100}=x-\frac{5}{13}\)

<=> \(\frac{1}{3}-\left(\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+....+\frac{1}{72}+\frac{1}{90}\right)-\frac{1}{100}=x-\frac{5}{13}\)

<=> \(\frac{1}{3}-\left(\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+.....+\frac{1}{9.10}\right)-\frac{1}{100}=x-\frac{5}{13}\)

<=> \(\frac{1}{3}-\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+.....+\frac{1}{9}-\frac{1}{10}\right)-\frac{1}{100}=x-\frac{5}{13}\)

<=> \(\frac{1}{3}-\left(\frac{1}{3}-\frac{1}{10}\right)-\frac{1}{100}=x-\frac{5}{13}\)

<=> \(\frac{1}{3}-\frac{1}{3}+\frac{1}{10}-\frac{1}{100}=x-\frac{5}{13}\)

<=> \(\frac{9}{100}=x-\frac{5}{13}\)

<=> \(x=\frac{5}{13}+\frac{9}{100}=\frac{617}{1300}\)