\(=\dfrac{1}{9}\cdot\left(\dfrac{4}{11}+\dfrac{7}{11}\right)=\dfrac{1}{9}\)
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So sanh A va B
A=-1/2011-3/11^2-5/11^3-7/11^4
B=-1/2011-7/11^2-5/11^3-3/11^4
1)
a) 2/3 - 4 .(1/2 +3/4)
b) (-1/3 + 5/6) . 11-7
c) 3/4 - 3/5 + 3/7 + 3/11 / 13/5 - 13/5 + 13/7 + 13/11
d) 3/11 . 4/15 + 19/15 . -3/11
các bạn giúp mình nhé !
a,7/4+-3/5
b,2021-(1/3)^2 x 3^2
c,7,5 x(-3/5)
d,(-1/4)^2 x 4/11+7/11 x(-1/4)^2
e, A= 1/4 +1/4^2+1/4^3+...+1/4^2020<1/3
A= 1/1×2+1/2×3+...1/98×99+1/99×100
B=4/3×7+4/7×11+4/11×15+...4/107×111
C=7/10×11+7/11×12+7/12×13+...7/69×70
Các bạn làm ơn giúp mình với
( 3-3/4+2/3)-(2+4/3-3/2)-(1-7/3-9/2)
-1/3-8/35+-2/9-1/135+4/5+-4/9+3/7
0,75+0,6-3/7-3/13
______________________
2,75+2,2-11/7-11/13
(3/4-13/11+7/5)-(3-1/2-35/11)+(11/4-2/5)
Tính giá trị biểu thức :
A = ( 3 - 1 / 4 + 2 /3 ) - ( 5 1/3 - 6/5 ) - ( 6 - 7/4 + 3 /2 )
B = 1 / 3 - 3 / 4 - ( -3/ 5 ) + 1 /64 - 2 / 9 - 1 /36 + 1 / 15
C = 1 / 3 - 3 / 5 + 5/7 - 7/ 9 + 9 /11 - 11 / 13 + 13 / 15 + 11/ 13 - 9 /11 + 7 / 9
D = 1/99 - 1 /99 x 98 - 1 / 98 x 97 - 1 /97 x 96 - ........ - 1 / 3x 2 - 1/ 2 x 1
Tính giá trị biểu thức :
A = ( 3 - 1 / 4 + 2 /3 ) - ( 5 1/3 - 6/5 ) - ( 6 - 7/4 + 3 /2 )
B = 1 / 3 - 3 / 4 - ( -3/ 5 ) + 1 /64 - 2 / 9 - 1 /36 + 1 / 15
C = 1 / 3 - 3 / 5 + 5/7 - 7/ 9 + 9 /11 - 11 / 13 + 13 / 15 + 11/ 13 - 9 /11 + 7 / 9
D = 1/99 - 1 /99 x 98 - 1 / 98 x 97 - 1 /97 x 96 - ........ - 1 / 3x 2 - 1/ 2 x 1
frac{1}{3}-frac{3}{5}+frac{5}{7}-frac{7}{9}+frac{9}{11}-frac{11}{13}+frac{11}{15}+frac{11}{13}-frac{9}{11}+frac{7}{9}-frac{5}{7}+frac{3}{5}-frac{1}{3}frac{-3}{4}.31frac{11}{23}-0,75.8frac{12}{28}left(2frac{1}{3}+3frac{1}{2}right):left(-4frac{1}{6}+3frac{1}{7}right)+7frac{1}{2}4frac{5}{9}:left(-frac{5}{7}right)+5frac{4}{9}:left(-frac{5}{7}right)frac{2}{3}-4left(frac{1}{2}+frac{3}{4}right)left(1-frac{1}{2}right).left(1-frac{1}{3}right).left(1-frac{1}{4}right)....left(1-frac{1}{n+1}right)nin Z
Đọc tiếp
\(\frac{1}{3}-\frac{3}{5}+\frac{5}{7}-\frac{7}{9}+\frac{9}{11}-\frac{11}{13}+\frac{11}{15}+\frac{11}{13}-\frac{9}{11}+\frac{7}{9}-\frac{5}{7}+\frac{3}{5}-\frac{1}{3}\)\(\frac{-3}{4}.31\frac{11}{23}-0,75.8\frac{12}{28}\)\(\left(2\frac{1}{3}+3\frac{1}{2}\right):\left(-4\frac{1}{6}+3\frac{1}{7}\right)+7\frac{1}{2}\)\(4\frac{5}{9}:\left(-\frac{5}{7}\right)+5\frac{4}{9}:\left(-\frac{5}{7}\right)\)\(\frac{2}{3}-4\left(\frac{1}{2}+\frac{3}{4}\right)\)\(\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right)....\left(1-\frac{1}{n+1}\right)n\in Z\)