cho ham so f(x)=-4*x^3+x. chung minh f(-a)=-f(a)
GIUP MK VS BAI NAY MK CUG CAN RAT GAP A GIUP MK DI MN OI!!!!
cho day ti so (2*a+b+c+d)/a=(a+2*b+c+d)/b=(a+b+2*c+d)/c=(a+b+c+2*d)/d tinh A=(a+b)/(c+d)+(b+c)/(d+a)+(c+d)/(b+a)+(d+a)/(b+c)
chung minh: a^2 + b^2 - 3ab /c^2 + d^2 - 3cd = (2a-b)^2 / (2c-d)^2
giup mk vs nhe mina thanhs nhieu
Cho a=b+c va c=bd/b-d. Chung minh rang : a/b=c/d
giup minh nhanh len nhe
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???
giup mik vs cho b^2 = ac . chứng minh (a^2+b^2) / (b^2+c^2) = a/c
cho a/b=c/d, chung minh:
a2-b2/c2-d2=ab/cd
Thanks nhiu!!!!!!!! ( vs dieu kien phai giup mk cai da)
giup em voi
cho ti le thuc \(\frac{a+b}{b+c}=\frac{c+d}{d+a}\)
chung minh rang |a| = |c| hoac |a+b| +|c=d|
ai lam nhanh nhat, dung nhat em tick choa
Cho tam giac ABC can tai B ke BH vuong goc AC ( H thuoc AC )
a) Chung minh: HA = HC
b) Ke HD vuong goc AB ( D thuoc AB ), HE vuong goc BC ( E thuoc BC ). Chung minh: HD = HE
c) Chung minh: tam giac BDE can
d) Chung minh: \(BE^2+DH^2=BC^2-HA^2\)
MINH DANG CAN GAP NHO CAC BAN GIUP CHO ( phan a, b, c cac ban co the lam hoac ko thi tuy nhung nho cac ban giup minh phan d )
CAM ON CAC BAN NHIEU
cho hai so huu ti a/b va c/d voi mau duong, trong do a/b < c/d . chung minh rang :
a . ad < bc b . a/b < a+c / b+d < c/d
giup mk nha
