B. -3a < -3b
C.
Mathematics, 30.07.2021 17:20, 4tazaouiamine1r
Cho a < b bất đẳng thức nào say đây đúng :
A. a - 4 < b - 4
B. -3a < -3b
C. 
D. a - b >0
Answers: 2
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Cho a < b bất đẳng thức nào say đây đúng :
A. a - 4 < b - 4
B. -3a < -3b
C.
B. -3a < -3b
C.
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