=1,28(16,5+82,5+1)=1,28x100=128

 1,28x16,5+1,28x82,5+1,28

=1,28x(16,5+82,5+1)

=1,28x100

128

 1,28x16,5+1,28x82,5+1,28

=1,28x(16,5+82,5+1)

=1,28x100

=128

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

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

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

Tính :

a . \(\left(135,6-78,9\right)\div2,5+3,39\times3\) 

 \(=56,7\div2,5+3,39\times3\)

\(=22,68+10,17\)

\(=32,85\)

b . \(5,67\div\left(1,28+1,72\right)+2015\)

\(=5,67\div3+2015\)

\(=1,89+2015\)

\(=2016,89\)

a, (135,6 - 78,9) : 2,5 + 3,39 x 3

= 56,7 : 2,5 + 10,17

= 22,68 + 10,17

= 32,85

b, 5,67 : (1,28 + 1,72) + 2015

= 5,67 : 3 + 2015

= 1,89 + 2015

= 2016,89

a) đề bài nhé                                                                                                                                              = 56,7  :   2,5  +  10,17

=      22,68   +   10,17

=           32,85 

b) đề bài luôn 

= 5,67 :  3  +  2015

=   1,89    +   2015

=      2016,89

\(\frac{19}{4}-\frac{37}{100}+\frac{1}{8}-\frac{32}{25}-\frac{5}{2}+\frac{7}{2}=\left(\frac{19}{4}-\frac{37}{100}-\frac{32}{25}\right)+\left(\frac{7}{2}-\frac{5}{2}\right)+\frac{1}{8}=\frac{31}{10}+1+\frac{1}{8}=\frac{169}{40}\)

sai đề nha mọi người

\frac8/8\

\(\left(4\frac{3}{4}+\frac{1}{8}+3\frac{1}{12}\right)-\left(0,37+1,28+2,25\right)\)

\(=7\frac{23}{24}-4,15\)

\(=7\frac{23}{24}-4\frac{3}{20}\)

\(=3\frac{97}{120}\)

Các bạn viết hẳn ra ạ

a) 1,28:0,125+1,28×0,25+1,28×1,75

=1,28x(8+0,25+1,75)

=1,28x10=12,8

b) bạn nên viết rõ ra