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\(\frac{2323+1313+1414+1515+1616}{4141+2222+2323+2424+2525}\)
=\(\frac{8181}{13635}\)
\(\frac{1010+1111+1212+1313+1414+1515}{2020+2121+2222+2323+2424+2525}=\frac{10\times101+11\times101+12\times101+13\times101+14\times101+15\times101}{20\times101+21\times101+22\times101+23\times101+24\times101+25\times101}=\frac{101\times\left(10+11+12+13+14+15\right)}{101\times\left(20+21+22+23+24+25\right)}\)
\(=\frac{10+11+12+13+14+15}{20+21+22+23+24+25}=\frac{75}{135}=\frac{5}{9}\)
1010+1111+1212+1313+1414+1515= 7575
2020+2121+2222+2323+2424+2525= 13635
\(\frac{A}{B}=0,2=\frac{1}{5}\)
\(B-A=2424\Rightarrow B=2424+A\)
Thay B=2424+A vào A/B=1/5 ta đc
\(\frac{A}{2424+A}=\frac{1}{5}\Rightarrow5A=2424+A\)
\(\Rightarrow4A=2424\Rightarrow A=606\)
\(B=2424+606=3030\)
\(\frac{767676}{252525}+\frac{2424}{2525}=\frac{76}{25}+\frac{24}{25}\)
\(=\frac{76+24}{25}=\frac{100}{25}=4\)
123+2424+353
= 2547+353
=2900
= 2547+353
=2900