\(\frac{a+b}{c+d}=\frac{b+c}{d+a}\Rightarrow\frac{a+b}{b+c}=\frac{c+d}{d+a}=\frac{a+b+c+d}{b+c+d+a}=1\Rightarrow a+b=b+c\Rightarrow a=c\)
Chon cau tra loi dung Neu a+b/b+c=c+d/d+a thi
a)a phai bang c
b)a=c hay a+b+c+d=0
c)a+b+c+d phai bang 0
d)a+b+c+d khac 0 neu a=c
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 1/c=1/2(1/a+1/b)(voi a,b,ckhac 0; b khac c). CMRa/b=a-c/c-b
Cho a+b/a-b=c+d/c-d CMRa/b=c/d
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-d
cho a/b = b/c = c/d = d/a va a + b + c + d khac 0. CMR: a= b= c= d.
giai ho minh voi
tim ti le thuc a/b =c/d[a,b,ckhac 0,a khac±b,c khac ±d
CAU A, a-b/b=c-d/d
cmr
a] neu\(\frac{a+b+c}{a+b-c}=\frac{a-b+c}{a-b-c}\) trong do b khac 0 thi c=0
