Câu 20. Phát biểu nào sau đây là đúng:
A.
2 2
x y x y
B.
2...
Mathematics, 26.07.2021 15:00 chauntkm9
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
Answers: 1
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