Urgent ~ ~ ~ what should I do with page 33 of the sixth grade math book published by Beijing Normal University? It will expire tomorrow! ! ! Please help! ! thank you

The first question: (1) is directly proportional, because the perimeter is equal to four times the side length, so the longer the side length, the longer the perimeter, which is directly proportional;

(2) Inverse ratio: because the distance from home to school is certain, the greater the average speed, the less time it takes;

(3) Out of proportion

The third question: (1) inverse ratio: the floor area of the room is fixed, and the larger the floor tile area, the less the total number of floor tiles needed;

(2) The number of tiles needed for this floor =(0.2*600)/0.5=240.

(3) The area of each floor tile =(0.2*600)/500=0.24 (the area of each floor tile multiplied by the number of required floor tiles equals the area of the ground).

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