Yes . I think learning is not solid and easy to make mistakes. Memorize the definition in the book, focusing on what is not equal to 0, these inconspicuous places. Do more math problems, practice makes perfect, and be careful in exams. If you are not careful, this will not change for a while. Let your mother urge you to do more and do something with your heart, and it will be fine over time.

It takes 5 hours for Party A to walk the same road, 4 hours for Party B, and the speed ratio between Party A and Party B is 5:4. ( × )

An angle greater than 90 is an obtuse angle. ( × )

Processing a farm tool, once every 80 yuan, now every 64 yuan. How much is the cost reduced?

The quotient of natural number A divided by natural number B is 10, so the greatest common divisor of A and B is ().

10

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