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=tứ : tam = tám : tư = hai

4:3 là tứ chia tam , tứ chia tam là tám chia tư=2

mình ko chép của ai cả, tự nghĩ

tổng quát:  1/n(n+1)(n+2)=1/2[1/n(n+1) - 1/(n+1)(n+2)]

chắc là 29 pạn ạ mk k chắc !

Vì AB và AM là hai tia đối nhau 

suy ra điểm A nàm giữa hai điểm B và M 

suy ra AB+AM=BM

Vì AB và BN là hai tia đối nhau

suy ra điểm B nằm giữa hai điểm A và N

suy ra BA + BN = AN

Mà AM = BN và AB = AB

suy ra AB + AM = BA + BN

hay BM = AN

Vậy BM = AN

Nhớ k cho mình nếu bạn thấy đúng

6^(5x+2)=36^(3x-4)

=>6^(5x+2)=(6^2)^(3x-4)

=>6^(5x+2)=6^6x-8

=>5x+2=6x-8

=>5x-6x=-8-2

=>-x=-10=>x=10