(1/3+1/9+1/27+1/81)÷x=11/2
40/81 : x = 11/2
x= 40/81 : 11/2
x=80/891
Tim x
(1/3+1/9+1/27+1/81)÷x=11/2
(1/3+1/9+1/27+1/81)÷x=11/2
40/81 : x = 11/2
x= 40/81 : 11/2
x=80/891
Tính nhanh
a ) ( 81 , 6 x 27 , 3 – 17 , 3 x 81 , 6 ) x ( 32 x 11 - 3200 x 0 , 1 - 32 )
b ) ( 13 , 75 – 0 , 48 x 5 ) x ( 42 , 75 : 3 + 2 , 9 ) x ( 1 , 8 x 5 – 0 , 9 x 10 )
c ) ( 792 , 81 x 0 , 25 + 792 , 81 x 0 , 75 ) x ( 11 x 9 – 900 x 0 , 1 – 9 )
Ai làm nhanh thì mình tick cho.
1 Tinh
a) 1+1/3 +1/9+1/27+1/81.
b) 37,52+4,7 *2,3 - 9,8 .
2 Tim x
a)x: 4,37 = 5,6( du 1,53).
b) 13,5 x (x:5,6) = 36,45
Tìm x: x+1+\(\dfrac{1}{3}\)+\(\dfrac{1}{9}\)+\(\dfrac{1}{27}\)+\(\dfrac{1}{81}\)=2
Tìm x
( x+1/3)+(x+1/9)+(x+1/27)+(x+1/81)=56/81
Tìm x:
( x+1/3) + (x+1/9)+(x+1/27)+(x+1/81) = 56/81
a,
x-2/3-2/15-2/35-2/63=1/9
b
(x+1
3)+(x+1/9)+(x+1/27)+(x+1/81)=56/81
c,
(1/3*5+1/5*7+1/7*9+.....+1/19*21)*x=9/7
d,3+5+7+...+2015/2+4+6+...+2016+x=1
e,2/6+2/12+2/20+...+2/x*(x+1)=2013/2015
TÌM X HỘ MIK NHA MÌNH CẢM ƠN\(\left(X+\frac{1}{1\cdot3}\right)+\left(X+\frac{1}{3\cdot5}\right)+...+\left(X+\frac{1}{23\cdot25}\right)=11\cdot X+\left(\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}+\frac{1}{242}\right)\)
\(\left(x+\dfrac{1}{3}\right)+\left(x+\dfrac{1}{9}\right)+\left(x+\dfrac{1}{27}\right)+\left(x+\dfrac{1}{81}\right)=\dfrac{56}{81}\)
Tim y biet :
( y + 1/3 ) + ( y + 1/9 ) + ( y + 1/27 ) + ( y + 1/81 ) = 56/81
