Question

tính : 1/5 + 1/25 + 1/125

Các bạn giải chi tiết nhé

Answer 1

1/5+1/25+1/25=1*5/25+1/25+1/25=5/25+1/25+1/25=5+1+1/25=7/25

Answer 2

Đổi: \(\frac{1}{5}=\frac{25}{125}\)

         \(\frac{1}{25}=\frac{5}{125}\)

Vậy \(\frac{1}{5}+\frac{1}{25}+\frac{1}{125}=\frac{25}{125}+\frac{5}{125}+\frac{1}{125}\)= \(\frac{31}{125}\)

Answer 3

MC(5; 25; 125)=125

Ta có: \(\frac{1}{5}=\frac{1.25}{5.25}\frac{25}{125}\)và     \(\frac{1}{25}=\frac{1.5}{25.5}=\frac{5}{125}\) và giữ nguyên \(\frac{1}{125}\)

=> \(\frac{1}{5}+\frac{1}{25}+\frac{1}{125}\)=\(\frac{25}{125}+\frac{5}{125} +\frac{1}{125}\)= \(\frac{25+5+1}{125}\)=\(\frac{31}{125}\)

Vậy : \(\frac{1}{5}+\frac{1}{25}+\frac{1}{125}\)=\(\frac{31}{125}\)