\(\frac{12}{12}-\frac{108}{108}=?\)
ai tick minh tick lai cho
B=\(\frac{1}{1.4}\)+ \(\frac{1}{12}\)+\(\frac{1}{36}\)+\(\frac{1}{108}\)+\(\frac{1}{324}\)+\(\frac{1}{972}\)
ai nhanh tick
\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+;;;;+\frac{1}{110}\)
AI NHANH TAY TICK 5 LAI NHE !
\(A=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{110}\)
\(A=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{10.11}\)
\(A=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{10}-\frac{1}{11}\)
\(A=1-\frac{1}{11}\)
\(A=\frac{10}{11}\)
Giải nhanh giúp mình với :
Tính nhanh :
\(\frac{1}{18}+\frac{1}{54}+\frac{1}{108}+....+\frac{1}{990}\)
Mình đang cần gấp ! Ai nhanh mình tick !
\(\frac{1}{18}+\frac{1}{54}+\frac{1}{108}+...+\frac{1}{990}\)
\(=\frac{1}{3\cdot6}+\frac{1}{6\cdot9}+\frac{1}{9\cdot12}+...+\frac{1}{30\cdot33}\)
\(=\frac{1}{3}\left(\frac{3}{3\cdot6}+\frac{3}{6\cdot9}+\frac{3}{9\cdot12}+...+\frac{3}{30\cdot33}\right)\)
\(=\frac{1}{3}\left(\frac{1}{3}-\frac{1}{6}+\frac{1}{6}-\frac{1}{9}+\frac{1}{9}-\frac{1}{12}+...+\frac{1}{30}-\frac{1}{33}\right)\)
\(=\frac{1}{3}\left(\frac{1}{3}-\frac{1}{33}\right)\)
\(=\frac{1}{3}\cdot\frac{10}{33}=\frac{10}{99}\)
\(\frac{1}{18}+\frac{1}{54}+\frac{1}{108}+...+\frac{1}{990}\)
\(=\frac{1}{3.6}+\frac{1}{6.9}+\frac{1}{9.12}+...+\frac{1}{30.33}\)
\(=\frac{1}{3}\left(\frac{1}{3}-\frac{1}{6}+\frac{1}{6}-\frac{1}{9}+\frac{1}{9}-\frac{1}{12}+...+\frac{1}{30}-\frac{1}{33}\right)\)
\(=\frac{1}{3}\left(\frac{1}{3}-\frac{1}{33}\right)\)
\(=\frac{1}{3}.\frac{10}{33}\)
\(=\frac{10}{99}\)
\(\frac{1}{18}+\frac{1}{54}+...+\frac{1}{990}\)
\(=\frac{1}{3.6}+\frac{1}{6.9}+...+\frac{1}{30.33}\)
\(=\frac{1}{3}\left(\frac{1}{3.6}+\frac{1}{6.9}+...+\frac{1}{30.33}\right)\)
\(=\frac{1}{3}\left(\frac{1}{3}-\frac{1}{6}+\frac{1}{6}-\frac{1}{9}+...+\frac{1}{30}-\frac{1}{33}\right)\)
\(=\frac{1}{3}\left(\frac{1}{3}-\frac{1}{33}\right)=\frac{10}{99}\)
từ tỉ lệ thức\(\frac{12}{18}\)=\(\frac{24}{36}\)=sosanh chung với các tỉ số \(\frac{12}{18}\)và\(\frac{36}{54}\)
\(\frac{12+24+72}{18+36+108}\) ; \(\frac{12-24+72}{18-36+108}\)
\(\dfrac{12}{18}=\dfrac{24}{36}=\dfrac{72}{108}=\dfrac{12+24+72}{18+36+108}=\dfrac{12-24+72}{18-36+108}\)
chuyển phân số thành hỗn số
\(\dfrac{12}{5}\)
\(\dfrac{37}{6}\)
\(\dfrac{108}{9}\)
chỉ cách làm nha
mik tick cho
`12/5 =` `2``2/5`
``37/6 =` `6``1/6`
`108/9 =` `12``0/9`
Tính nhanh
A=\(\frac{1}{10}-\frac{1}{40}-\frac{1}{88}-\frac{1}{154}-\frac{1}{238}-\frac{1}{340}\)
B=\(\frac{1}{3}-\frac{1}{8}-\frac{1}{54}-\frac{1}{108}-\frac{1}{180}-\frac{1}{270}-\frac{1}{378}\)
Ai nhanh và đúng mình tick cho
Tính nhanh:
a) 234 - 117 + (-100) + (-234)
b) -927 + 1421 + 939 + (-1421)
c) 11 - 12 + 13 - 14 + 15 -16 + 17 - 18 + 19 - 20
d) 101 - 102 - (-103) - 104 - (-105) - 106 - (-107) - 108 - (-109) -110
ai nhanh mik tick cho 3 tick
a/ 234 - 117 + (-100) + (-234) = 234 + (-234) - 117 + (-100) = -217
b/ -927 + 1421 + 939 + (-1421) = 1421 + (-1421) - 927 + 939 = 12
c/ 11 - 12 + 13 - 14 + 15 -16 + 17 - 18 + 19 - 20
= (-1) + (-1) + (-1) + (-1) + (-1) = -5
d/ 101 - 102 - (-103) - 104 - (-105) - 106 - (-107) - 108 - (-109) -110
= (101 - 102) - [( -103) + 104] - [ (-105) + 106] - [(-107) + 108] - [(-109) + 110]
= (-1) - 1 - 1 - 1 - 1 = -5
\(\frac{1}{4}+\frac{1}{12}+\frac{1}{36}+\frac{1}{108}+...+\frac{1}{2010}+\frac{1}{6030}\)
đặt A=1/4+1/12+1/36+........+1/6030
3A=1+1/4+1/12+.........+1/2010
-2A=1/6030-1
A=(1/6030-1)/-2
RÚT GỌN PHÂN SỐ SAU: \(\frac{-63}{108};\frac{-33}{-77};\frac{-5}{10};\frac{14}{63};\frac{-15}{25};\frac{-45}{18};\frac{12}{15};\frac{20}{25};\frac{31}{12}\)
\(\frac{-63}{108}\)= \(\frac{-7}{12}\)
\(\frac{-33}{-77}\)= \(\frac{3}{7}\)
\(\frac{-5}{10}\)=\(\frac{-1}{2}\)
\(\frac{14}{63}\)=\(\frac{2}{9}\)
\(\frac{-15}{25}\)=\(\frac{-3}{5}\)
\(\frac{-45}{18}\)=\(\frac{-5}{2}\)
\(\frac{12}{15}\)=\(\frac{4}{5}\)
\(\frac{20}{25}\)=\(\frac{4}{5}\)
\(\frac{31}{12}\):Là phân số tối giản
t.i.c.k nha