Câu 20. Phát biểu nào sau đây là đúng: A.
2 2
x y x y   
B.
 
2 2 2
x y x y   

C. x y   0 thì
x  0
hoặc
y  0 D.
x y   0
thì
xy  0

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

Luke wants to reduce the area of his rectangular garden by 1/4 the expression 14/w can be used to represent this change. what is another way to write this expression?

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?