=2,85 nha bạn

tích mình ik

so sorry máy mik đang có chuyện lên mik sẽ k sau cho những cho trả lời nha

X=2,85           X=72,5

\(1,28\cdot5+1,28:0,25+1,28\)

\(=1,28\cdot5+1,28\cdot4+1,28\)

\(=1,28\left(5+4+1\right)\)

\(=1,25\cdot10=12,5\)

1,28:0,125+1,28.0,25+1,8.1,75

=1,28.\(\frac{1}{8}\)+1,28.\(\frac{1}{4}\)+1,8.\(\frac{7}{10}\)

=1,28\(\left(\frac{1}{8}+\frac{1}{4}\right)\)+\(\frac{9}{5}\).\(\frac{7}{10}\)

=1,28\(\left(\frac{1}{8}+\frac{2}{8}\right)\)+\(\frac{63}{50}\)

=\(\frac{32}{25}\cdot\frac{3}{8}+\frac{63}{50}\)

\(=\frac{12}{25}\)

a: =>10y=12,5

=>y=1,25

b: =525p:5=105p

c: 25,6*3,07=78,592

x=3,44

\(x\times12=40+1,28\\ \Rightarrow x\times12=41,28\\ \Rightarrow x=41,28:12\\ \Rightarrow x=3,44\)

3,44

X=16:(1,28:0,5)=6,25

\(16:x=1,28:0,5\\ 16:x=2,56\\ x=16:2,56\\ x=6,25\)

16:x=1,28:0,5

16:x=2,56

     x=16:2,56

     x=6,25

12 : (x * 3) = 1,28 + 2,72

12 : (x * 3) = 4

x * 3 = 12 : 4

x * 3 = 3

x = 3 : 3

x = 1

`->` x = 1.