Cho tam giác ABC có BC = 6cm. Vẽtrung tuyến AD, lấy điểm I trên AD sao cho = 12. BI cắt AC tại E, CI cắt AB tại F. a) Chứng minh rằng: EF // BC. b) Tính EF

step-by-step explanation:

b

step-by-step explanation:

step-by-step explanation:

a child is 12 years old, and his father is 32 years older. in how many years will the age of the father be 2 times the age of the child?

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this needs to be the answer format, or else your answer is incomplete.

if the number of years is x, then the equation is

in __ years