chung minh rang : a/b= c/d suy ra a/b=a+c/b+d
giup minh nhe !!! cam on nhieu minh se mk voi???
Cho tam giac ABC vuong tai A (AB>AC) phan giac goc B cat AC tai D.Ke DH vuong goc vs BC
a)Chung minh :AD=DH
b)Lay diem E thuoc tia AC sao cho AE=ab ke duong thang vuong goc vs AE tai E cat tia DH tai K.Chung minh gocDBK=45 do
Giup mk vs mai ktra r cam on ><
cac ban giup minh lam bai nay nhe
12^25+25^21-21*(2/5*9)/3 chung minh chia het cho 54
giup minh nhe cam on cac ban nhieu
Tim x,y biet
x^2+y^6=0
Minh dang rat gap giup minh voi nhe. Minh cam on!
chung minh neu goc B lon hon goc C thi AC>AB
giup minh voi. cam on nhieu
Giai giup minh cau nay voi minh cam on
1,tim x
a,2\(^{4-2x}\)=16\(^4\)
Cho tam giac ABC vuong tai A (AB>AC) phan giac goc B cat AC tai D.Ke DH vuong goc vs BC
a)Chung minh :AD=DH
b)Lay diem E thuoc tia AC sao cho AE=ab ke duong thang vuong goc vs AE tai E cat tia DH tai K.Chung minh gocDBK=45 do
Giup mk vs mai ktra r cam on ><
giai cau b thoi nha ^^ cau a de qua
cho tam giac def co d=90.ek phan giac e.ke kh⊥ef
cmr;a ekd=ekh
b;kd=kh
giai giup minh nhe
cam on mn ☺
ai giup minh voi cam on nhiu
A=75.(4^2004 +4^2003 +...+4^2 +4 +1) +25 là số chia hết cho 10