`1/2+(-1/57)+1/3+1/6`
`=(1/2+1/3+1/6)-1/57`
`=(3/6+2/6+1/6)-1/57`
`=6/6-1/57`
`=1-1/57`
`=57/57-1/57`
`=56/57`
=57/114 + 2/114 + 38/114 + 19/114
= 58/57
Tính hợp lí.
a,A=-2/9+-3/4+3/5+1/15+1/57+1/3+-1/36
b,B=1/2+-1/5+-5/7+1/6+-3/35+1/3+1/41 help me!
1 + \(\dfrac{1}{3}\) + \(\dfrac{1}{6}\) + \(\dfrac{1}{10}\)
+......+ \(\dfrac{2}{x(x+1)}\) =1\(\dfrac{1989}{1991}\)
HeLp me
1 + \(\dfrac{1}{3}\) +\(\dfrac{1}{6}\)+\(\dfrac{1}{10}\) +......+
\(\dfrac{2}{x(x+1)}\) =1\(\dfrac{1989}{1991}\)
\(\dfrac{help}{me}\)
Tìm y
a) ( 1/2*4 + 1/4*6 + 1/6*8 + 1/8*10) * y =1/3
b) ( 1/1*3 + 1/3*5 + 1/5*7 + 1/7*9 + 1/9*11) * y =2/3
Help me please!!!!!!!!!!!!!
Tìm x,y thuộc N biết:
1/ ( x + 1)( y + 2) = 5
2/ ( x + 1)(y + 3) = 6
3/ ( x + 2)( y + 3) = 6
4/ ( x - 1) ( y + 3) = 6
5/ ( x - 1)( y - 3) = 5
Help me!!!
tìm x
-5 nhân ( x+1/5 )-1/2 nhân ( x - 2/3) = 3/2 nhân x - 5/6
help me
HELP ME
tính:
A=(1/51+1/52+...+1/100)/(1/1*2+1/3*4+.....+1/99*100)
B=(1-1/3)(1-1/6)(1-1/10)(1-1/15)....(1-1/780)
TÍNH NHANH : B=(1+1/2)+(1+1/3)+(1+1/4)+(1+1/5)+(1+1/6)+(1+1/7)
HELP ME CÀNG NHANH CÀNG TỐT!!!!!!!!!!!!!!!!!!!!!!!! Hạn làm bài 19/5/2020
| -2/3 x + 0,4 | . 5/3 - 3/2= 1/6
help me please T o T
