Chiều cao thửa ruộng là:
` 39 × 2 : 5 = 15,6 (m)`
Diện tích thửa ruộng là:
`(20 + 15) × 15,6 : 2 = 273 (m²)`
Đáp số: `273m²`
Đáp án:
`273` `m^2`
Giải thích các bước giải:
Chiều cao thửa ruộng hình thang là :
`39` `×` `2` `:` `5` `=` `15,6` `(m)`
Diện tích khi chưa mở rộng là :
`(20 + 15)` `×` `15,6` `:` `2` `=` `273` `(m^2)`
Đáp số : `273` `m^2`
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Khai triển biểu thức sau $(x - 2y - 3 ) ^{2}$
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