Toán cho pt y=x2-2(m+1)x+m2-m+3=0 tính penta theo m 08/10/2021 By Gianna cho pt y=x2-2(m+1)x+m2-m+3=0 tính penta theo m
`\Delta’=[-(m+1)]^2-m^2+m-3`
`\Delta’=m^2+2m+1-m^2+m-3`
`\Delta’=3m-2`