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thachdau2k7
7 tháng trước

Một khu vườn hình chữ nhật có diện tích 900m2 và chu vi 122m. Tìm chiều dài và chiều rộng của khu vườn.

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Vanh Trương
7 tháng trước

Đáp án:

Chu vi = 122 m
=> nửa chu vi = 61 m
đặt chiều rộng là a, chiều dài là b
có: a.b=900
      a+b=61
giải hệ sẽ tính đc b=25, a=36

Giải thích các bước giải:

 

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