BT:Tìm x,y thoả mãn :
a) | x - 2017 | + | y- 2018 | < 0
b) 3.| x - y |5 + 10.| y + \(\dfrac{2}{3}\)|7 \(\le\) 0
c) \(\dfrac{1}{2}\). ( \(\dfrac{3}{4}x-\dfrac{1}{2}\))2018 + \(\dfrac{2017}{2018}\).|\(\dfrac{4}{5}y+\dfrac{6}{25}\)| \(\le\)0
d) 2017.|2x - y|2018 + 2018.|y - 4 | \(\le\) 0
... Helpppp Meeee vs các bn yêu dấu !!!!