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NguYễn Lê ThAnh NgÂn
a ) /x/ = 2, 5
x= 2,5 : -2,5
b) ko tồn tại
c) /x/ + 0,573 = 2
/x/ = 2 - 0,573
/x/ = 1,427
x= 1,427 : - 1,427
tự hỏi tự làm,y hệt con điên.