=2x(1/12+1/20+1/30+...+1/3660+1/3782)
=2x(1/(3x4)+1/(4x5)+1/(5x6)+...+1/(60x61)+1/(61x62)
=2x(1/3-1/4+1/4-1/5+1/5-1/6+...+1/60-1/61+1/61-1/62)
=2x(1/3-1/62)=2x59/186=59/93
(1/6 + 1/10 + 1/15) : (1/6 + 1/10 - 1/15)
(1/6 + 1/10 + 1/15) :(1/6 +1/10-1/15)
(1/2-1/3+1/4-1/5):(1/4-1/6)
(1/6 +1/10+1/15) / (1/6+1/10-1/15)
(1/2-1/3+1/4-1/5) / (1/4-1/6)
a ) 43/20 + 17/6 : ( 5/8 + 7/30 )
b ) ( 1/6 + 1/10 + 1/15 ) : ( 1/6 + 1/10 - 1/15 )
tính giá trị của biểu thức
A (1/6 + 1/10 + 1/15 ) : (1/6+1/10-1/15) / (1/2-1/3+1/4-1/5) : (1/4-1/6)
B (3/20+1/2-1/15 )12/49 / 3 1/3 + 2/9
các bn giúp mk nhé
a ( 1/6 + 1/10 + 1/15 ) : ( 1/6 + 1/10 - 1/15)
b ( 1/2 - 1/3 + 1/4 - 1/5 ) : ( 1/4 - 1/5)
\(\left(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}\right):\left(\frac{1}{6}+\frac{1}{10}-\frac{1}{15}\right)\)
\(\dfrac{\left(\dfrac{1}{6}+\dfrac{1}{10}+\dfrac{1}{15}\right):\left(\dfrac{1}{6}+\dfrac{1}{10}-\dfrac{1}{15}\right)}{\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{4}-\dfrac{1}{5}\right):\left(\dfrac{1}{4}-\dfrac{1}{6}\right)}=\)
tính giá trị biểu thức :
A= (1/6+1/10+1/15):(1/6+1/10-1/15) phần (1/2-1/3+1/4-1/5):(1/4-1/6)
B= (3/20+1/2-1/15).12/49 phần 3\(\frac{1}{3}\)+ \(\frac{2}{9}\)