cho a/b=b/c=c/d=d/a va a+b+c khac 0.
Tinh M = 2a-b/c+d + 2b-c/a+d + 2c-d/a+b + 2d-a/b+c
cho a/b = b/c = c/d = d/a va a + b + c + d khac 0. CMR: a= b= c= d.
Cho a+b+c+d khac 0 va a/b+c+d=b/a+c+d=c/a+b+d=d/a+b+c.
Tinh gia tri A= a+b/c+d + b+c/a+d + c+d/a+b + d+a/b+ch
Cho a/b=b/c=c/d va b+c+d khac 0. CMR a/d=(a+b+c)3/(b+c+d)3
Cho mình hoi câu này với nhé:
CMR:nếu a+c=2*b va 2*b*d=c*(b+d) thi a/b=c/d voi b,d khac 0
chung minh rang tu ti le thuc a/b=c/d (a-b khac 0,c-d khac 0) ta co the suy ra ti le thuc a+b/a-b=c+d/c
ai giai nhanh va dung cho toi hieu toi se tich nguoi do
Cho a = b + c va c = bd/b -d ( b , d khac 0 ) .chung minh rang a/b = c/d
1) cho a/b=c/d chung minh:
a) a^2+c^2/b^2+d^2=a^2-c^2/b^2+d^2
b) (a+c)^2/(b+d)^2=(a-c)^2/b^2+d^2
2) a) cho x/y=y/z=z/x va x+y+z khac 0
tinhx^333.z^666/y^999
b) cho a.c=b^2 ; a.b=c^2 va a+b khac 0 ; a ; b ; c kha 0 ,tinh b^333/a^111.c^222
cho \(\frac{a^2+b^2}{c^2+d^2}=\frac{ab}{cd}\) voi a; b; c khac 0 va c khac cong tru d . CMR \(\frac{a}{b}=\frac{c}{d}\)