Hướng dẫn giải:
Chiều rộng thửa ruộng đó là:
`90xx3/5=54(m)`
Diện thích thửa ruộng là:
`90xx54=4860(m^2)`
Diện tích cái ao đó là:
`4860:100xx15=729(m^2)`
Đáp số: Diện tích thửa ruộng là `4860m^2`
Diện tích cái ao đó là: `729m^2`
`1.`
Chiều rộng thửa ruộng là:
`90 × 3/5 = 54 (m)`
Diện tích thửa ruộng là:
`90 × 54 = 4860 (m^2)`
`2.`
Diện tích đào ao đó là:
`4860 : 100 × 15 = 729 (m^2)`
Đáp số:
`1) 4860 m^2`
`2) 729 m^2`
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