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Urgent! ! Come on, math problem! ! The fifth and sixth questions in HD are answered for free! ! !
The answer to these questions is this.

(2) This is a question of proportional application. Reason: When the bottom is expanded several times, the area is also expanded several times at the same time, but the ratio of the area to the bottom is unchanged, which is 1.5, so it is proportional.

(3)y= 1.5x

(4) (expanded) (1.5 times)

(5)(7.5)(5)

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