Viết lại, ta có :

\(\frac{0,25\times96\times0,25\times1}{3}\)

\(=\frac{0,25\times4\times0,125\times8\times1\times3}{3}\)( Tách \(96=4\times8\times3\))

\(=\frac{1\times1\times3}{3}\)

\(=\frac{3}{3}=1\)

bang 1

tại sao lại nhân 4 và nhân8

\(13,25:(0,5+0,25+0,125)=13,25:0,875=15,14285714\) =)

TK

\(13,25:0,5+13,25:0,25+13,25:0,125\\ =13,25\times2+13,25\times4+13,25\times8\\ =13,25\times\left(2+4+8\right)\\ =13,25\times14\\ =185,5\)

\(13,25:0,5+13,25:0,125+13,25:0,125\\ =13,25\times2+13,25\times4+13,25\times8\\ =13,25\times\left(2+4+8\right)\\ =13,25\times14\\ =185,5\)

=13,25×2+13,25×4+13,25×8

=13,25×(2+4+8)

=13,25×14

=185,5

   20,22: 0,125+ 20,22: 0,25- 20,22- 20,22
= 20,22: 0,125+ 20,22: 0,25- 20,22× 1- 20,22× 1
= 20,22× 8+ 20,22× 4- 20,22× 1- 20,22× 1
= 20,22× ( 8+ 4- 1- 1)
= 20,22× 10
= 202,2

= 20,22 x 8 + 20,22 x 4 - 20,22 x 2

= 20,22 x (8 + 4 - 2)

= 20,22 x 10

= 202,2

\(13,8:0,5+13,8:0,25+13,8:0,125\)
\(=13,8\times2+13,8\times4+13,8\times8\)
\(=13,8\times\left(2+4+8\right)\)
\(=13,8\times14\)
\(=193,2\)

Cần gấp

13,8:(0.5+0,25+0.125)

=13,8:1

=13,8