264,14 : 0,25 : 4

= 264,14 : ( 0,25 x 4 )

= 264,14 : 1

= 264,14 

36,45 : 0,2 x 2 : 5

=  36,45 : ( 2 x 5 ) : 0,2

= 36,45 : 10 : 0,2 

= 3,645 : 0,2

= 18,225

\(a,2,3:0,25+7,7.4\\ =2,3.4+7,7.4\\ =\left(2,3+7,7\right).4=10.4=40\\ b,4,2.8+5,8:0,125\\ =4,2.8+5,8.8\\ =\left(4,2+5,8\right).8=10.8=80\\ c,3,4.4+5,6:0,25+4\\ =3,4.4+5,6.4+4\\ =\left(3,4+5,6+1\right).4=10.4=40\\ d,4:0,2+12:0,5+1,2:0,25\\ =4.5+12.2+1,2.4\\ 4.5+6.4+1,2.4\\ =4\left(5+6+1,2\right)\\ =4.12,2=48,8\)

❤

a/\(12,5\times35,4\times0,8\)
\(=\left(12,5\times0,8\right)\times35,4\)
\(=10\times35,4\)
\(=354\)
b/\(4,7:0,25+4,7:0,2+4,7\)
\(=4,7\times4+4,7\times5+4,7\times1\)
\(=4,7\times\left(4+5+1\right)\)
\(=4,7\times10\)
\(=47\)

ra 80 đó chuẩn không cần nói

= (120-20) - 0.5*4*10*0.2*5*4*0.25

= 100 -  2*10*1*1 

= 100- 20 

=80

8,17 : 0,5 + 817/100 x 7 + 8,17 : 0,25 + 8,17 + 81,7 x 0,1 : 0,2 + 8,17

= 8,17 x 2 + 8,17 x 7 + 8,17 x 4 + 8,17 x 1 + 81,7 : 10 x 5 + 8,17 x 1

= 8,17 x 2 + 8,17 x 7 + 8,17 x 4 + 8,17 x 1 + 8,17 x 5 + 8,17 x 1

= 8,17 x (2 + 7 + 4 + 1 + 5 + 1)

= 8,17 x 20

= 163,4

=200*0,05=200*1/20=10

1/20 ở đâu?

\(2020:0,2+2020+2020:0,25\)

\(=2020:\dfrac{1}{5}+2020+2020:\dfrac{1}{4}\)

\(=2020\times5+2020+2020\times4\)

\(=2020\times \left(5+1+4\right)\)

\(=2020\times10\)

\(=20200\)

\(\frac{19,8:0.2.44,44.2.13,2:0,25}{3,3.88,88:0,5.6,6:0,125.5}\) \(=\frac{19,8.5.44,44.2.13,2.4}{3,3.88,88.2.6,6.8.5}=\frac{3,3.6.5.44,44.2.6,66.4}{3,3.44,44.2.6,6.8.5}\)

                                                                                                                  \(=\frac{6.2.2}{8}=3\)

19,8:0.2.44,44.2.13,2:0,253,3.88,88:0,5.6,6:0,125.5  =19,8.5.44,44.2.13,2.43,3.88,88.2.6,6.8.5 =3,3.6.5.44,44.2.6,66.43,3.44,44.2.6,6.8.5 

                                                                                                                  =6.2.28 =3

*Ryeo*

\(13,25:0,5+13,25:0,2+13,25:0,25\\ =13,25\times2+13,25\times5+13,25\times4\\ =13,25\times\left(2+5+4\right)\\ =13,25\times11\\ =145,75\)

\(=13,25:\left(0,5+0,2+0,25\right)\\ =13,25:1,25=10,6\)