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HA
5
9 tháng 3 2022
Bài 4:
b: BC=5cm
Xét ΔABC có AD là phân giác
nên BD/AB=CD/AC
=>BD/3=CD/4
Áp dụng tính chất của dãy tỉ số bằng nhau, ta được:
\(\dfrac{BD}{3}=\dfrac{CD}{4}=\dfrac{BD+CD}{3+4}=\dfrac{5}{7}\)
Do đó; BD=15/7(cm); CD=20/7(cm)
NN
1
8 tháng 5 2022
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It was told that I was the best...city
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DC
1
17 tháng 2 2022
unpollute
deforestation
environmental
pollution
conservationists
prevention
extremely
environmentalist
protection
seriously
poisonous
a)245
b)475
HT :)
A.bằng 254
B.bằng 484 bạn nhé