\(\frac{80\%\times40\%\times1,25\times25+0,725+0,275}{1,25\times32\times25}\)

\(=\frac{\frac{80}{100}\times\frac{40}{100}\times1,25\times25+1}{1,25\times32\times25}=\frac{\frac{32}{100}\times1,25\times25}{1,25\times32\times25}+\frac{1}{1,25x\times32\times25}\)

\(=\frac{32}{100}:32+\frac{1}{1,25\times32\times25}=\frac{1}{100}+\frac{1}{1000}=\frac{11}{1000}\)

Hok tốt

\(\frac{80\%\cdot40\%\cdot1,25\cdot25+0,725+0,275}{1,25\cdot32\cdot25}=\frac{0,8\cdot0,4\cdot1,25\cdot25+0,725+0,275}{1,25\cdot8\cdot4\cdot25}\)

\(=\frac{\left(0,8\cdot1,25\right)\cdot\left(0,4\cdot25\right)+1}{\left(1,25\cdot8\right)\cdot\left(4\cdot25\right)}=\frac{1\cdot10+1}{10\cdot100}=\frac{10+1}{1000}=\frac{11}{1000}\)

465,725

=\(\frac{\left(0,8.1,25\right).\left(0,4.25\right)+1}{\left(4.25\right).\left(1,25.8\right)}\)=\(\frac{1.10}{100.10}=\frac{10}{1000}=\frac{1}{100}\)

ko hieu

bạn ko hiểu cho nào để mk chỉnh sửa

32/100

725/1000

1245/100

= 32/100

= 725/1000

= 1245/100

a) 7/5    3/8    16/25         b)

a) \(\frac{7}{5}=1,4\)

     \(\frac{3}{8}=0,375\)

       \(\frac{16}{25}=0,64\)

b) \(0,32=\frac{8}{25}\)

     \(0,725=\frac{29}{40}\)

     \(12,45=\frac{249}{20}\)

Bài 2:

B lớn hơn A.

Bài 2 : 

B lớn hơn A

6*x+7.19*x=3.558

(6+7.19)*x=3.558

13.19*x=3.558

x=3.558/13.19

=0.2697498105

tính nhanh

0,8 x 0,4 x 1,25 x 25 + 0,725 + \(\frac{0,25}{2,25\times4\times8\times25}\)

= (0,8 x 0,4) x (1,25 x 25) + 0,725 + \(\frac{0,25}{2,25\times4\times8}\)

= 0,32          x          31,25 + 0,725 + \(\frac{0,25}{2,25\times4\times8}\)

= 10                                   + 0,725 + \(\frac{0,25}{2,25\times4\times8}\)

= 10                                   +         18,725

= 28,725

Hk tốt,

k nhé

Chắc ko đó bạn