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Super simple junior high school mathematics is urgent about algebra filling in the blanks! ! ! ! ! ! ! ~
(1) Number of people in a * * *

(2) The area of 36 such squares

(3) 1 What is less than one third of x?

(4) What is the area of a circle with an outer diameter of X and an inner diameter of B?

I'm not sure what I was thinking. Maybe it's just for your reference, because your topic may not be clearly expressed. I'm sorry