Các câu hỏi tương tự
1. Tính
a) 5/7 x 4 : 5/9
b) 8 x 2/3 : 1/2
c) 6 : 3/5 - 7/6 x 6/7
21/5 x 10/11 + 57/11
2. Tìm x
a) 35/9 : x = 35/6
b) (1/1x2 + 1/2x3 + 1/3x4 +1/4x5 +1/5x6) x 10- x = 0
[ 1/3 + 1/5 ] + [ 1/6 - 1/5 ]
3/16 x 7/5 + 3/5 x 9/16
1/1x2 + 1/2x3 + 1/ 3x4 + ...... + 1/2020x2021
1/1x3 + 1/3x5 + 1/5x7 + ..... + 1/2021 x 2023
3/2 x 1/7 x 5/4 + 15/2 x 6/7 x 1/4
NHỜCÁC BN LM GIÚP MIK GẤP CHIỀU NAY MIK CẦN ÒI !!!!!~~~
Tìm X:
a,2xX-5=21
b,3/4+1/4xX=5/6
c,7/8-1/2xX=5/6
d(1/1x2+1/2x3+1/3x4)x100-[5/2:(X+206/100)]:1/2=89
a)A=1+2+3+4+......+0
b)B=1/1x2 + 1/2x3 + 1/3x4 +.....+1/99x100
c)C=1 + 1/3 + 1/6 =1/10+.....+1/120
d)D=1/1x4 + 1/1x7 1/7 x 10+.....+1/97x106
e)1/2 x (1+2) + 1/3 x (1+2+3) + 1/4 x(1+2+3+4) +......+1/16 x (1+2+...+16)
Tính nhanh
\(G=1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}+\frac{1}{243}\)
Tìm x
\(\frac{3}{1x2}+\frac{3}{2x3}+\frac{3}{3x4}+.....+\frac{3}{Xx\left(X+1\right)}=\frac{6042}{2015}\)
Ai nhanh mk sẽ tick
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
4 tháng 8 2017 lúc 16:17
tính nhanh
a)100-98+96-94+...+4-2
b)1+2-3-4+5+6-7+-8+9+10-11-12+13+2010
c)(864x11-423x4):(432x(3+6+9+...+27-132))
d)1x2+2x3+3x4+...+99x100
e)\(\frac{1+\left(1+2\right)+\left(1+2+3\right)+\left(1+2+3+4\right)+...+\left(1+2+3+...+99\right)}{1x9+2x98+3x97\: +....+99x1}\)
giúp mk với , mk tick cho 3 tick , nha !!!!
tính tổng: 1/1x2 + 1/2x3 + 1/ 3x4 +...+ 1/98 x 99 + 1/99 x 100
BÀi 1 tính
a, 1+ 2+3 + ... + n
b , 1x2 + 2x3 + 3x4 + ... + 99 x 100