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vuthihongngoc035
2 năm trước
Bài 1: Tìm tọa độ hình chiếu H của điểm M trên đường thẳng d và điểm đối xứng M' của M qua d trong mỗi trường hợp sau a) M(2,1) và d: 2x+y-3=0. b) M(3,-1)và d: 2x+5y-30=0 Bài2 Lập pt đường thẳng d'đối xứng vs đt d qua điểm I trong mỗi trường hợp a) I(3,1) và d:2x-3y+1=0 b) I(-2,1) và d:2x-3y+7=0
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