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Nguyễn Lê Phước Thịnh
12 tháng 6 2023 lúc 23:19

6:

Gọi chiều dài là x

=>Chiều rộng là 3/4x

Theo đề, ta có: 3/4x^2=300

=>x=20

=>Chiều rộng là 15m

Chu vi là (20+15)*2=70(m)


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