Vẽ hình và giải giúp em với please 😭😢😭 em thật sự cần gấp lắm luôn á 😿😿😿😿
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a)Xét ΔAKB và ΔCAB có:
\(\widehat{AKB}=\widehat{BAC}=90^o\left(gt\right)\)
\(\widehat{C}chung\)
⇒ΔAKB ~ ΔCAB(g-g)
b)Xét ΔABC có:OB=OC(O là trung điểm BC);BI=AI(I là trung điểm AB)
⇒OI là đường TB ΔABC(đ/n)
⇒OI//AC(t/c)
Mà AC⊥AB(gt) ⇒OI⊥AB(t/c)
Xét ΔBOI và ΔBAK có:
\(\widehat{BIO}=\widehat{BKA}=90^o\)
\(\widehat{B}\) chung
⇒ΔBOI ~ ΔBAK(g-g)
⇒\(\dfrac{BI}{BK}=\dfrac{BO}{BA}\Rightarrow BI.BA=BK.BO\)(đpcm)
những bụi tre ngà vì bị ngựa phun lửa nên ngả màu vàng óng.những vết chân ngựa thành những hồ ao liên tiếp.khi ngựa thét ra lửa,lửa đã thiêu cháy 1 làng ,nên làng đó gọi là làng Cháy
a: Xét ΔABC có
M là trung điểm của AB
N là trung điểm của AC
Do đó: MN là đường trung bình của ΔBAC
1. He was so weak that he couldn't stand.
=> He was too weak to stand.
2. He is now strong. He can work without help.
=> He is strong enough to work without help.
3. That knife is very sharp. You ought not to give it to a little boy.
=> That knife is too sharp to be given to a little boy.
4. He was polite. He asked us to dinner.
=> He was too polite to ask us to dinner.
5. The teacher explained very clearly. Everybody understood.
=> The teacher explained clearly enough for everyone to understand.
1. He was so weak that he couldn't stand.
=> He was too weak to stand.
2. He is now strong. He can work without help.
=> He is strong enough to work without help.
3. That knife is very sharp. You ought not to give it to a little boy.
=> That knife is too sharp to be given to a little boy.
4. He was polite. He asked us to dinner.
=> He was too polite to ask us to dinner.
5. The teacher explained very clearly. Everybody understood.
=> The teacher explained clearly enough for everyone to understand.
Xin lỗi em mới lớp ... 4 thôi hà :(