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thanhhuyen2001421
2 năm trước
Cho biểu thức A = x căn x+1 / x-1 - x-1/ căn x +1. a,tìm điều kiện xác định và rút gọn A. b,tính giá trị biểu thức A khi x =9/4. c,tìm tất cả các giá trị của x để A<1
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