Cuộc thi toán :^^:
Ko ns nhiều:
1 \(Cho:ax^3=by^3=cz^3.Và:\frac{1}{x}+\frac{1}{y}+\frac{1}{z}=1.CM:\sqrt[3]{a}+\sqrt[3]{b}+\sqrt[3]{c}=\sqrt[3]{ax^2+by^2+cz^2}\)
2. \(CMR:nếu:\frac{x^2-yz}{x\left(1-yz\right)}=\frac{y^2-xz}{y\left(1-xz\right)}.x\ne y;zyx\ne0;yz\ne1;zx\ne1.\Rightarrow xy+yz+zx=xyz\left(x+y+z\right)\)