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k minh nha
ket ban nua
Đổi \(2,25=\frac{9}{4}\)
Tới bước này ta làm bài toán theo những bài toán hiệu - tỉ
Hiệu số phần bằng nhau là :
\(9-4=5\)( phần)
Giá trị của một phần là:
\(\frac{2,25}{5}=0,45\)
=> Số lớn là:
\(0,45.9=4,05\)
Số bé là :
\(4,05-2,25=1,8\)
Vậy ...
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