cho ham so y=(m+1)x+m co do thi (d)
a)tim diem co dinh ma do thi luon di qua voi moi m
b)khi m=-2.xac dinh goc tao boi do thi va truc ox
c)tim m de khoang cach tu ) toi (d) lon nhat
CAU a VA b MINH LAM DUOC RUI CON CAU C RA DAP AN NO CU KI KI K DUOC CHAC CHAN MN JUP MJK CHI CACH GIAI CAU C NHA 
ta co diem co dinh la:I(-1,-1).goi H la hinh chieu cua O len d  :OHOI.dau = xay ra khi 
H trung  I.
de khoang cach tu O den d lon nhat khi OI vuong goc voi dOI×d=0( den day thui .ban tu giai tep di)
de nghi ban k copy dap an cua tac gia –  nhutuyet12t7.1995 01-01-13 09:43 PM
ta co diem co dinh la:I(-1,-1).goi H la hinh chieu cua O len d  :\(
OH\leq OI.\)dau = xay ra khi 
H trung  I.
de khoang cach tu O den d lon nhat khi OI vuong goc voi d\(
\Rightarrow \overrightarrow{OI}\times \overrightarrow{d}=0
\)( den day thui .ban tu giai tep di)

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