RÚT GỌN BT:P=[-4x/x^2-1].[(1-x ² ) ²/4x ²] 26/08/2021 Bởi Alexandra RÚT GỌN BT:P=[-4x/x^2-1].[(1-x ² ) ²/4x ²]
`P={-4x}/{x^2-1}.(1-x^2)^2/{4x^2}` `P={-4x}/{x^2-1}.(x^2-1)^2/{(-4x)(-x)}` `P={-4x.(x^2-1)(x^2-1)}/{(x^2-1)(-4x)(-x)}` `P={x^2-1}/{-x}` `P={1-x^2}/{x}.` Bình luận
`P={-4x}/{x^2-1}.(1-x^2)^2/{4x^2}`
`P={-4x}/{x^2-1}.(x^2-1)^2/{(-4x)(-x)}`
`P={-4x.(x^2-1)(x^2-1)}/{(x^2-1)(-4x)(-x)}`
`P={x^2-1}/{-x}`
`P={1-x^2}/{x}.`
`P = -4x/x^2 – 1 . (1 – x^2)^2`
`P = -x^4 + 2x^2 – 4/x – 1`