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Math problem in the fifth grade of primary school: (1) six sevenths plus eight sevenths minus five twentytwo (2)0.8 minus seven fifths (3) one seventeenth plus ten.
I don't think I have finished writing all the questions.

Teach you a method of answering questions: (2)9=8, how many eighths? =7 and 7 parts? =6 and how many sixths are there?

9=8+? =7+? =6+?

=8+ 1=7+2=6+3 Three question marks are equal to 1, 2, 3 respectively. How many eighths?

How many eighths is 1? ; How much is two equal to seven? ; Three is one sixth?

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