Tìm x, y biết

a)\(|2x-3|+|y-2|=0\)

b)\(|3x-4|+|x-y|=0\)

c) \(|2x+y-1|+|2y-3|=0\)

d) \(|x+y-5|+|2x-y+8|=0\)

BT1: Tìm x, biết:

5) \(\text{|}x+\dfrac{1}{2}\text{|}+\text{|}x+\dfrac{1}{3}\text{|}+\text{|}x+\dfrac{1}{4}\text{|}=4x\)

BT2: Tìm x, biết:

4) \(\text{|}\text{|}2x-1\text{|}-3\text{|}=1\)

BT1: Tìm x, biết:

3) \(\dfrac{1}{2}\text{|}\dfrac{1}{3}x-\dfrac{1}{4}\text{|}-\dfrac{1}{5}=\dfrac{1}{6}\)

\(\left|4x\right|-\left|-13,5\right|=\left|2\dfrac{1}{4}\right|\)

Tìm giá trị lớn nhất hoặc nhỏ nhất của biểu thức sau

a, A = \(2x^2-2\)

b, B = \(\left|x+\dfrac{1}{3}\right|-\dfrac{1}{6}\)

c, C = \(\dfrac{\left|x\right|+2017}{2018}\)

d, D = \(3-\left(x+1\right)^2\)

e, E = \(-\left|0,1+x\right|-1,9\)

f, F = \(\dfrac{1}{\left|x\right|+2017}\)

Tính nhanh:

\(\dfrac{3^9.49^3}{9^2.21^4}\)

Tính nhanh:

\(\dfrac{2^3.49^3}{14^2.7^5}\)

1/\(4.\left(\dfrac{-1}{2}\right)^{^{ }3}+\dfrac{1}{2}:5\)

2/\(17\dfrac{1}{5}:\left(\dfrac{-5}{7}\right)-2\dfrac{1}{5}.\left(\dfrac{-7}{5}\right)\)

Help me

Cho a;b;c;d\(e\)0

Biết:\(\dfrac{\text{b+c+d}}{\text{a}}\)=\(\dfrac{\text{c+d+a}}{\text{ }\text{b}}\)=\(\dfrac{\text{d+a+b}}{\text{c}}\)=\(\dfrac{\text{a+b+c}}{\text{d}}\)=\(k\)

Tính\(k\)