\(Tìm\) \(cặp\) \(số\) \(x,y\) \(thỏa\) \(mãn\) \(x,y\) \(\in\) Z \(và\) \(:\)
\(a)\left(x+5\right)\left(y-3\right)=0\)
\(b)\left(x-7\right)\left(2+y\right)=13\)
\(c)\left(-x+5\right)\left(2y+1\right)=15\)
\(d)\left(2y-1\right)\left(x+3\right)=-10\)
Bài 1 Tìm x ,y biết
a, 2| 2x -3 | =1
b,7,5 -3 | 5 -2x | = -4,5
c, | 3x-4 | + | 3y +5 |=0
Bài 2 Tìm x biết
a, \(\left|\frac{5}{3}x\right|\) =\(\left|-\frac{1}{6}\right|\)
b, \(\left|\frac{3}{4}x-\frac{3}{4}\right|-\frac{3}{4}=\left|-\frac{3}{4}\right|\)
c, \(\left|x+\frac{3}{5}\right|-\left|x-\frac{7}{3}\right|=0\)
Bài 3 Tìm x biết
a,| x |+| x+2 |=0
b,\(\left|x\left(x^2-\frac{5}{4}\right)\right|=x\)
Cho \(\left|x\right|\)\(\le3\) , \(\left|y\right|\)\(\le5\) ( x , y \(\in z\) ) . Biết x - y = 2 . Tìm x , y .
Tìm x thuộc Z, biết:
a. 1 + \(\left\{-2-[-3+\left(-4+\left|x\right|\right)]\right\}=1-2+[\left(-3-4\right)]\)
b. 34 + (9 - 21) = 3417 - (x + 3417)
c. x - \(\left\{55-[49+\left(-28-x\right)]\right\}=13-\left\{47+[25-\left(32-x\right)]\right\}\)
d. (15 - x) + (x - 12) = 7 - (-8 + x)
e. - 7 + \(\left|x-4\right|\) = - 3
f. 13 - \(|\)x + 5\(|\) = 13
g. \(|\)x + 1\(|\) > 2
h. \(|\)x + 2\(|\) ≤ 5
i. \(|\)x - 10\(|\) - (-12) = 4
Bài 1, Tìm x biết
a, \(\left|\frac{5}{3}x\right|=-\frac{1}{6}\)
b, \(\left|\frac{3}{4}x-\frac{3}{4}\right|-\frac{3}{4}=-\frac{3}{4}\)
c, \(\left|x+\frac{3}{5}\right|-\left|x-\frac{7}{3}\right|=0\)
Tìm x biết :
\(\dfrac{1}{2.4}+\dfrac{1}{4.6}+...+\dfrac{1}{\left(2x-2\right)2x}=\dfrac{1}{8}\left(x\in N,x\ge2\right)\)
(x-7).(x+3)<0. \(\left(x\in Z\right)\)
Bài 2 : Tìm x, biết :
1) \(x-\left|1\frac{1}{6}\right|=\frac{5}{21}\)
2) \(x+\left|-1\frac{2}{3}\right|=\left|-\frac{3}{4}\right|\)
3) \(\left|x-\frac{1}{3}\right|=\frac{5}{2}\)
4) \(\left|x+\frac{2}{3}\right|=0\)
5) \(\left|x+2\right|=\frac{1}{3}-\frac{1}{5}\)
6) \(\left|x-4\right|=\frac{1}{5}-\left(\frac{1}{2}-\frac{5}{4}\right)\)
7) \(\left|x-\frac{5}{4}\right|=-\frac{1}{3}\)
\(Tìm\) \(x\)∈\(Z\)\(,\) \(biết\)\(:\)
\(a\)) \(\left(x-20\right)+\left(x-19\right)+\left(x-18\right)+...+99+100=100\)
\(b\)) \(213-x.\left(\dfrac{1}{2}+\dfrac{1}{2^2}+\dfrac{1}{2^3}+...+\dfrac{1}{2^{2020}}\right):\left(1-\dfrac{1}{2^{2020}}\right)=13\)