Tìm x:
|x+1/1.3|+|x+1/3.5|+|x+1/5.7|+...+|x+1/97.99|
Tìm số tự nhiên x thỏa mãn 1/1.3 + 1/3.5 + 1/5.7 + ...+ 1/x(x + 2) = 8/17
tìm số tự nhiên x biết : 1/1.3+1/3.5+1/5.7+....+1/(2x-1)(2x+1)=49/99
Tìm x thuộc N, biết:
\(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{x.\left(x+2\right)}=\frac{8}{17}\)
Tìm x: [12/11-(1/2+1/44].(x-0,2)=1/1.3+1/3.5+1/5.7+1/7.9+1/9.11
Tìm x nguyên biết: \(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{x\left(x+2\right)}=\frac{16}{34}\)
Tìm x: [12/11-(1/2+1/44].(x-0,2)=1/1.3+1/3.5+1/5.7+1/7.9+1/9.11
câu 1 :tìm x y z biết 2x=3y;5x=7z và 3x-7y+5z=30
câu 2 : a) 1/3.5+1/5.7+..........+1/97.99
b)-1/3+1/3^2-1/3^3+.....+1/3^50-1/3^51
Tìm x biết :\(\dfrac{1}{1.3}+\dfrac{1}{3.5}+\dfrac{1}{5.7}+...+\dfrac{1}{\left(2x-1\right)\left(2x+1\right)}=\dfrac{49}{99}\)
tìm x,biết:
a) |3x-4|+|3y+5|=0
b) |x-y|+|x+9/25|=0
c) |x+1|+|x+2|+|x+3|=4x
d)|x+2|+|x+3/5|+|x+1/2|=42
e)|x+1/1.3|+|x+1/3.5|+|x+1/5.7|