Đáp án:
Giải thích các bước giải:
Bài 1.2
Ta có: BC=BH+HC=4+2=6cm
Áp dụng hệ thức lượng, ta có:
AB²=BC.BH=6.2=12
⇒AB=√12=2√3 cm
*TƯƠNG TỰ
AC²=BC.HC=6.4=24
⇒AC=2√6cm
*AH²=BH.HC=2.4=8
⇒AH=2√2cm
CHÚC BẠN HỌC TỐT >ω<
Bài 1.1 Sai độ dài BC
Bài 1.2 Xét Δ vuông ABC có:
$AH^2=BH.HC=8 cm⇒ AH=2\sqrt{2}$
$BC=BH+HC= 6 cm$
$AB=\sqrt{BH.BC}=\sqrt{12} cm$
$AC=\sqrt{HC.BC}=\sqrt{24} cm$
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Lớp 5A chỉ có 2 loại giỏi và khá. Cuối HK1, tỉ số giữa HS giỏi và khá là 3/2; cuối HK2 có thêm 1 HS khá trở thành HS giỏi nên tỉ só giữa giỏi và khá là 5/3. Tính số HS của lớp
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