\(\frac{1}{4}\times\frac{2}{6}\times\frac{3}{8}\times\frac{4}{10}\times\frac{5}{12}.....\frac{30}{62}\times\frac{31}{64}=2^x\)
1/Tìm x,y,z biết rằng:
a/ \(\frac{x}{3}=\frac{y}{4};\frac{y}{5}=\frac{z}{7}\) và x+y-z=14
b/(2x-5)2+(3y+4)4(2z-1)8 \(\le\)0
tìm x:
(x-3)+2x2-6x=0
tính:
A=\(\left|x+\frac{3}{2}\right|-\left|x-1\right|+\left|x-\frac{3}{4}\right|\)
\(\frac{5}{6}-\frac{23}{12}.x=\left(-\frac{1}{2}\right)^3\)
\(B=\frac{-2}{3}+\frac{3}{4}-\frac{-1}{6}+\frac{-2}{5}\)
Tìm x biết
a,\(\frac{x-1}{x+5}\)=\(\frac{6}{7}\)
b,\(^{\left(x-\frac{1}{2^{ }}\right)^2}\)+\(\frac{2}{9}\)=\(\frac{2}{3}\)
1) tìm x:
a) 3(x+2)-(x+2)=0
b) (x2+1).(x+2019)=0
c) (x-3)+2x2-6x=0
2) tính :
A=\(\left|x+\frac{3}{2}\right|-\left|x-1\right|+\left|x-\frac{3}{4}\right|\)
Bài 1 Tìm các số x,y,z biêt:\(\frac{x}{2}\)=\(\frac{y}{3}\)=\(\frac{z}{5}\) và 4x-5y+2z = 30
Tính nhanh
\(\left(\frac{1}{4.9}+\frac{1}{9.14}+\frac{1}{14.19}+...+\frac{1}{44.49}\right).\frac{1-3-5-7-...-49}{89}\)