### Class 10 Book Solution from Miscellaneous in Ratio and Proportion Question No: 3.2(45)

যদি $\frac{x^2-yz}{a}=\frac{y^2-zx}{b}=\frac{z^2-xy}{c}$ হয়, প্রমান করো যে (a + b + c)(x + y + z) = ax + by + cz