Xet tam giac ABC,ap dung tinh chat duong phan giac,ta co

AM tren MB=AC tren CB=AB tren CB=AN tren NC[= b tren a]

Vay MN//BC[dinh ly dao cua dinh ly thales]

Suy ra MN tren BC=AM trenAB=b tren b+a

Vay nen MN=ab tren a+b

tam giac ABC can tai A nen AB=AC=12cm

Xet tam giac ABC ,ap dung tinh chat duong phan giac ta co

AD tren AB=AC tren CB=12 tren 6=2

Do do,DB=12-8=4CM

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moi truong tren can nam linh chi cay xuong rong

moi truong duoi nuoc ca duoi,bach tuoc

Khau phan an thieu iodine co the dan den benh buou co vi iodine la chat can thiet de tuyen giap san xuat hormone t3,t4

Doy quy la tinh trang nao bi ton thuong do qua trinh cung cap mau cho nao bi gian doan hoac giam dang ke do tac mach mau hoac vo mach mau

Nguyen nhan co tac dong manh nhat gay mat can bang mat tu nhien

vd Quan the lua song tren canh dong