রাশি তিনটির যোগফল নির্ণয় কর।

রাশি তিনটির যোগফল
=(5x^2-2xy+3y^2)+(x^2-3xy)+(-y^2+5xy)


=5x^2-2xy+3y^2+x^2-3xy-y^2+5xy
=6x^2-5xy+2y^2+5xy
=6x^2+2y^2 (ans).

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