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makomob12
2 năm trước
C1.cho góc xOy=90, Điểm A ko thuộc (xOy), d(A,Ox)=d(A,Oy)=a, AO=(a √7)/2. tính d(A,(Oxy)) C2. cho tam giác ABC vuông tại B, AB=a, BC=2a. Gọi Ax, By là 2 tia cùng vuông góc và cùng phía đối với (ABC), lấy M thuộc Ax, N thuộc By, AM=a, BN=2a √2. tính d(M,CN)
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