Đáp án:
$xy^2.(x-3y)$
$= xy^2.x+xy^2.(-3y)$
$= x²y²-3xy³$
$\text{+) Áp dụng Tổng quát: A.(C-D) =AC-AD}$
` xy^2 ( x - 3y )`
` = xy^2 . x - xy^2 . 3y `
` = x^2 y^2 - 3xy^3 `
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