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B

bome_thang

goi A(x,y,x) la hinh chieu cua M vao mp
thuoc do thi sau do lm the kieu pt tham so
roi co MAvuong goc vs mat phang
giai 2 pt la ra diem hinh chieu
b/ ta tim dk diem A rui thi A se la td cua MM' --->M'
 
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