(7X^2Y^3-8X^3Y^2Z)÷(8X^2Y^2)
=X^2Y^2(7Y-8XZ)÷(8X^2Y^2)
=(7Y-8XZ)÷8
=7Y/8-XZ
(7X^2Y^3-8X^3Y^2Z)除以8X^2Y^2
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