Bác nông dân muốn mua phân đạm để bón giao.Ở cửa hàng có 2 loại phân đạm (NH2)2CO giá 7100 đồng và (NH4)2SO4 giá 3600 đồng . Hãy giúp bác nông dân chọn loại phân tiết kiệm hơn

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Đáp án:

 

Giải thích các bước giải:

Gỉa sử bác nông dân còn bón 1kg Nito

Ta có 

60Kg (NH2)2CO chứa 28g Nito

1kg nito chứa 2,14kg (NH2)2CO

Sô tiền phải trả là 

2,14x7100=15194 VNĐ

132 kg (NH4)2SO4 chứa 28Kg Nito

1Kg Nito chứa 4,17kg (NH4)2SO4

Số tiền phải trả là 

4,71x3600=16956 VNĐ

→( NH2)2CO là loại phân KT hơn

#Trumhoahocc

Đáp án:

 

Giải thích các bước giải:

Giả sử `n` = 1 

`m` = 1 kg

60 kg  `(NH_2)_2CO` có: 28kg N 

Vậy 1kg có: $\frac{1.60}{28}$ ≈ 2,14 kg N 

Số tiền = 2,14 . 7100 = 15194 VNĐ

132 kg `(NH_4)_2SO_4` có 28kg N 

Vậy 1kg có : $\frac{1.132}{28}$ ≈ 4,7kg N 

Số tiền = 4,7 . 3600 = 16920 VNĐ

16920 > 15194

→  mua `(NH_2)_2CO` sẽ tiết kiệm hơn 

Chúc bạn học tốt #aura

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