Ta có:\(\dfrac{a}{b}=\dfrac{c}{d}\Rightarrow1+\dfrac{b}{a}=1+\dfrac{d}{c}\Rightarrow\dfrac{a+b}{a}=\dfrac{c+d}{c}\)
\(\Rightarrow\left(\dfrac{a+b}{a}\right)^3=\left(\dfrac{c+d}{c}\right)^3\Rightarrow\dfrac{a^3}{\left(a+b\right)^3}=\dfrac{c^3}{\left(c+d\right)^3}\)
cho a/b=b/c=c/d CMR: a^3+b^3+c^3/b^3+c^3+d^3=a/d
cho a/b=b/c=c/d
cmr a^3+b^3+c^3/b^3+c^3+d^3=a/d
Cho: a/b=c/d. CMR: (a-b/c-d)^3=a^3=b^3/c^3+d^3
cho tỉ lệ thức a/c =b/c =c/d CMR a^3 + b^3 +c^3/ b^3 + c^3 + d^3 = a/b
cho a/c =c/b . cmr a^3+c^3-b^3/b^3+c^3-d^3=a/b
Cho a/b=c/d . CMR
(a+b/c+d)^3=a^3-b^3/c^3-d^3
Cho b^2=ac;c^2=bd. CMR a^3+b^3-c^3/b^3+c^3-d^3=(a+b-c/b+c-d)^3
cho b^2 = ac , c^2 = bd CMR : (a^3+b^3-c^3) / (b^3+c^3-d^3) =(a+b-c/b+c-d)^3
cho a/b = c/d ; c khác o
CMR(a-b/c-d)^2 =ab/cd
(a+b/c+d)^3=(a^3-b^3)/(c^3-d^3)
