tìm xb 2/5 - 3/4 : x = -1/2 c 5/7 - 2/3 . = 4/5d 2/3 -4 .x = -5/6

tìm x

b 2/5 - 3/4 : x = -1/2

c 5/7 - 2/3 . = 4/5

d 2/3 -4 .x = -5/6

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