18. (x² + xy + yº) x (x - y)
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( x² ± xy)( x - y)
( x² ± xy)( x - y) x² ( x-y ) + xy(x-y)
( x² ± xy)( x - y) x² ( x-y ) + xy(x-y)x³ - x²y + x²y - xy²
( x² ± xy)( x - y) x² ( x-y ) + xy(x-y)x³ - x²y + x²y - xy² x³ - xy³
ans :::::----- x³ - xy³
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