x=39

Chiều dài của mảnh vườn còn lại sau khi làm đường là: 

100 - 2 x 2 = 96 (m)

Chiều rộng của mảnh vườn còn lại sau khi làm đường là:

  80 - 2 x 2 = 76 (m)

Diện tích của mảnh vườn là:

96 x 76 = 7296 (m2)

Diện tích lối đi là:

 100 x 80 - 7296 = 704 (m2)

Chi phí làm đường là: 200 000 x 704 = 140 800 000 (đồng)

Đáp số:

Diện tích làm đường 704 m2

Chi phí làm đường140 800 000 đồng

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VÌ LÀ KỂ NÊN PHAI KỂ BẰNG NGÔI THỨ 2

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