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The problems you missed are listed below with answers and explanations.  Look over the explanation for each problem so you can understand why you missed it!

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Fractions are multiplied straight across (top * top / bottom * bottom). If you were to cross multiply the fractions, you would actually be dividing them, as it would achieve the same thing.

Fractions are divided by flipping the second fraction and then multiplying. If you can't multiply fractions, you wouldn't be able to do the second step.

The basics of multiplication and division of fractions always remain the same. You may have to simplify before preforming the operation though (simplification of complex fractions usually involves multiplication and division of different fractions anyway).

To solve for x in any fraction, you take the "cross multiplication" and then solve. Cross multiplication invloves multiplying the top of one fraction by the bottom of the other, and the setting it equal to the opposite (bottom of the one multiplied by the top of the other)

To simplify a division of a polynomial, you may take each term seperatly. Or in other words split the original polynomial into seperate terms, and divide each term by what you want to divide the polynomial by (it must be the same). This will achieve the same thing.