One question, change 0.485 times 8.3 into 4, and 85 times 0.83. Two questions, write 0.86 times 4 times 25. Calculate the last two questions first, then express them in fractions, and then divide them into four questions.

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Five questions, write 9999 as11multiplied by 9 to become11multiplied by 9 multiplied by 7, and finally write 165438.