5+55+555+5555/7+77+777+7777
= 10039.5714286
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Ta có \(\frac{5+55+555+5555}{7+77+777+7777}\)
\(=\frac{5.\left(1+11+111+1111\right)}{7.\left(1+11+111+1111\right)}\)
\(=\frac{5}{7}\)
Vậy \(\frac{5+55+555+5555}{7+77+777+7777}=\frac{5}{7}\)
5+55+555+5555/7+77+777+7777
=5*(1+11+111+1111)/7*(1+11+111+1111)
=5/7
\(\frac{5+55+555+5555}{7+77+777+7777}\)
\(=\frac{5\left(1+11+111+1111\right)}{7\cdot\left(1+11+111+1111\right)}\)
\(=\frac{5}{7}\)