1414 + 1515 + ... + 2525 = 14*101 + 15 *101 + ... +25*101
= 101 * ( 14 + 15 +...+ 25)
= 101 * 234
= 23634
1414+1515+1616+1717+1818+1919/2020+2121+2222+2323+2424+2525
1414+1515+1616+1717+1818+1919/2020+2121+2222+2323+2424+2525
1414+1515+1616+1717+1818+1919 phần 2000+2121+2222+2323+2424+2525
1414+1515+1616+1717+1818+1919 / 2020+2121+2222+2323+2424+2525 = ?
Tính nhanh:1414+1515+1616+1717+1818+1919/2020+2121+2222+2323+2424+2525
SO sánh 1414+1515+1616+1717+1818+1919 với 11
2020+2121+2222+2323+2424+2525 15
tính nhanh
\(\frac{1414+1515+1616+1717+1818+1919}{2020+2121+2222+2323+2424+2525}\)
SO sánh 1414+1515+1616+1717+1818+1919/2020+2121+2222+2323+2424+2525 với 11/15 trả lời cho mình nha đang cần gấp
tính nhanh
\(\frac{1414+1515+1616+1717+1818+1919}{2020+2121+2222+2323+2424+2525}\)
