Tính nhanha)\(\frac{1}{3}\)-\(\frac{3}{4}\)-( -\(\frac{3}{5}\)) +\(\frac{1}{64}\)-\(\frac{2}{9}\)-\(\frac{1}{36}\)+\(\frac{1}{15}\)b)\(\frac{1}{3}\)-\(\frac{3}{5}\)+\(\frac{5}{7}\)-\(\frac{7}{9}\)+\(\frac{9}{11}\)-\(\frac{11}{13}\)+\(\frac{13}{15}\)+\(\frac{11}{13}\)-\(\frac{9}{11}\)-\(\frac{5}{7}\)+\(\frac{3}{5}\)-\(\frac{1}{3}\)c)\(\frac{1}{99}\)-\(\frac{1}{99.98}\)-\(\frac{1}{98.97}\)-\(\frac{1}{97.96}\)-...-\(\frac{1}{3.2}\)-\(\frac{1}{3.1}\)GIÚP MK NHA MK ĐAG CẦN GẤPMK SẼ TICK CHO...
Đọc tiếp
Tính nhanh
a)\(\frac{1}{3}\)-\(\frac{3}{4}\)-( -\(\frac{3}{5}\)) +\(\frac{1}{64}\)-\(\frac{2}{9}\)-\(\frac{1}{36}\)+\(\frac{1}{15}\)
b)\(\frac{1}{3}\)-\(\frac{3}{5}\)+\(\frac{5}{7}\)-\(\frac{7}{9}\)+\(\frac{9}{11}\)-\(\frac{11}{13}\)+\(\frac{13}{15}\)+\(\frac{11}{13}\)-\(\frac{9}{11}\)-\(\frac{5}{7}\)+\(\frac{3}{5}\)-\(\frac{1}{3}\)
c)\(\frac{1}{99}\)-\(\frac{1}{99.98}\)-\(\frac{1}{98.97}\)-\(\frac{1}{97.96}\)-...-\(\frac{1}{3.2}\)-\(\frac{1}{3.1}\)
GIÚP MK NHA MK ĐAG CẦN GẤP
MK SẼ TICK CHO BẠN
B. 1/3 - 1/3 - 3/5 +3/5 + 5/7 - 5/7 + 9/11 - 9/11 -11/13 + 11/ 13 + 7/9 + 13/15
= 0 -0-0-0-0+7/9 +13/15
= 74/45
b, Nhóm các cặp trái dấu vào với nhau thì hết cuối cùng còn 13/15
c,\(\frac{1}{99}-\frac{1}{99}+\frac{1}{98}-\frac{1}{98}+...+\frac{1}{2}-\frac{1}{3}+1\)
= \(\frac{1}{6}+1\)= 7/6