\(\left(25-x\right)+\left(29-x\right)+...+\left(101-x\right)=108\)
\(\Leftrightarrow\left(25+29+...+101\right)-\left(x+x+....+x\right)=108\)
\(\Leftrightarrow1260-20x=180\)
\(\Leftrightarrow20x=1080\)
\(\Leftrightarrow x=54\)
\(\left(25-x\right)+\left(29-x\right)+...+\left(101-x\right)=108\)
\(\Leftrightarrow\left(25+29+...+101\right)-\left(x+x+....+x\right)=108\)
\(\Leftrightarrow1260-20x=180\)
\(\Leftrightarrow20x=1080\)
\(\Leftrightarrow x=54\)
tìm x biết: \(\left|x+\frac{1}{101}\right|+\left|x+\frac{2}{101}\right|+....+\left|x+\frac{100}{101}\right|=101x\)
Giá trị của x thỏa mãn đẳng thức
\(\left|x+\frac{1}{101}\right|+\left|x+\frac{2}{101}\right|+\left|x+\frac{3}{101}\right|+...+\left|x+\frac{100}{101}\right|=100x\)
Tìm x biết
a)\(\left|2x-3\right|-x=\)\(\left|2-x\right|\)
b)\(\left|x+3\right|+\left|x+1\right|=\)\(3x\)
c)\(2005=\left|x-4\right|+\left|x-10\right|+\left|x+101\right|+\left|x+990\right|+\left|x+1000\right|\)
d)\(\left|x+\frac{1}{2}\right|+\left|x+\frac{1}{6}\right|+\left|x+\frac{1}{20}\right|+..+\left|x+\frac{1}{110}\right|=11x\)
Tìm x , biết :
a)\(|x+\frac{1}{101}|+|x+\frac{2}{101}|+|x+\frac{3}{101}|+...+|x+\frac{100}{101}|=101x\)
b) \(|x+\frac{1}{1\times3}|+|x+\frac{1}{3\times5}|+|x+\frac{1}{9\times13}|+...+|x+\frac{1}{97\times99}=50x\)
\(|A\left(x\right)|+|B\left(x\right)|+|C\left(x\right)|=D\left(x\right)\))
Tìm số nguyên x biết \(\left(x^2-\frac{4}{25}\right)\left(x^2-4\right)\left(x^2-\frac{16}{9}\right)\left(x^2-10\right)< 10\)
Tìm x biết
a) \(-x^2.\left(x^2-4\right)=-25.\left(x^2-4\right)\)
b) \(x^2.\left(2\left|x\right|-3\right)=\left|x^2\right|.\left(2\left|x-3\right|\right)\)
c) \(\left(2x-6\right)^2=\left(3x+1\right)^5\)
d) \(2\left|x-3\right|-\left|4-x\right|=1\)
25. Tìm x biết:
a) \(\left|x\right|+\left|x+2\right|=0\)
b) \(\left|x\left(x^2-\frac{5}{4}\right)\right|=x\)
Cho hàm số \(f\left(x\right)\)thoả mãn \(f\left(x+1\right)=x\left(-1\right)^{x+1}-2f\left(x\right)\)với mọi x và biết \(f\left(1\right)=f\left(101\right)\)
Hãy tính tổng : \(S=f\left(1\right)+f\left(2\right)+.....+f\left(100\right)\)
TÌM NGIỆM CỦA ĐA THỨC?
\(A\left(x\right)=2x+3\)
\(B\left(x\right)=4x^2-25\)
\(C\left(x\right)=x^2-7\)
\(D\left(x\right)=x\left(1-2x\right)+\left(2x^2-x+4\right)\)