simplify 1)-pqr(p²+q²+r²) 2) (px+qy)(ax-by)
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1- pqr ( p² + q² + r²) = p³qr + pq³r + pqr³
2- (px + py)(ax - by) = apx² - pxby + pyax - pby² = p(ax² - bxy + axy - by²)
they are simplified.
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