a)9200

9200

6400

b)50

50

19,5

c)128

128

60

a)    92 : 0,01 = 9200          92 x 100 = 9200        64 : 0,01= 6400

b)    25 : 0,5 = 50           25 x 2 = 50           39 : 0,5 = 78
c)    32 : 0,25 = 128         32 x 4 = 128          15 : 0,25 = 60

\(=\frac{1}{2}:\frac{1}{2}-\frac{1}{4}:\frac{1}{4}+\frac{1}{8}:\frac{1}{4}-\frac{1}{10}:\frac{1}{10}\)

\(=\frac{1}{2}\cdot2-\frac{1}{4}\cdot4+\frac{1}{8}\cdot4-\frac{1}{10}\cdot10\)

\(=1-1+\frac{1}{2}-1\)

\(=0+\frac{1}{2}-1=\frac{1}{2}-\frac{2}{2}=\frac{-1}{2}\)

nhanh giúp mk ạ

\(13,25:0,75+13,25:0,25+13,5:0,325\)

\(=13,25:\left(0,75+0,25+0,325\right)\)

\(=13,25:1,325\)

\(=10\)

\(\dfrac{1}{4}:0,25-\dfrac{1}{8}:0,125+\dfrac{1}{2}:0,5-\dfrac{1}{16}:0,0625\)

\(=\dfrac{1}{4}:\dfrac{1}{4}-\dfrac{1}{8}:\dfrac{1}{8}+\dfrac{1}{2}:\dfrac{1}{2}-\dfrac{1}{16}:\dfrac{1}{16}\)

\(=1-1+1-1\)

\(=0\)

\(\dfrac{1}{2}:0,5+\dfrac{1}{4}:0,25+\dfrac{1}{8}:0,125\)

\(=\dfrac{1}{2}\times2+\dfrac{1}{4}\times4+\dfrac{1}{8}\times8\)

\(=\dfrac{2}{2}+\dfrac{4}{4}+\dfrac{8}{8}=1+1+1=3\)

1/2 : 0,5 + 1/4 : 0,25 + 1/8 :0,25

đổi 1/2=0,5;1/4=0,25;1/8=0,125

=0,5:0,5+0,25:0,25+0,125:0,125

=1+1+1

=3

\(=\dfrac{1}{4}:\dfrac{1}{4}-\dfrac{1}{8}:\dfrac{1}{8}+\dfrac{1}{2}:\dfrac{1}{2}-\dfrac{1}{10}\)

\(=1-1+1-\dfrac{1}{10}\)

= 0,9

\(\dfrac{1}{4}:0,25-\dfrac{1}{8}:0,125+\dfrac{1}{2}:0,5-\dfrac{1}{10}\\ =\dfrac{1}{4}:\dfrac{1}{4}-\dfrac{1}{8}:\dfrac{1}{8}+\dfrac{1}{2}:\dfrac{1}{2}-\dfrac{1}{10}\\ =1-1+1-\dfrac{1}{10}\\ =\left(1-1\right)+\left(1-\dfrac{1}{10}\right)\\ =1-\dfrac{1}{10}\\ =\dfrac{10-1}{10}=\dfrac{9}{10}\)

=1/4:1/4-1/8:1/8+1/2:1/2-1/10

=1-1+1-1/10

=1-1/10

=9/10

`1/4:0,25-1/8:0,125+1/2:0,5-1/10`

`=1/4 : 1/4 - 1/8 : 1/8 + 1/2 :1/2 - 1/10 `

`=1/4 . 4/1 - 1/8 . 8/1 + 1/2 . 2/1 - 1/10`

` = 1  - 1 + 1 - 1/10 `

`=  1 - 1/10 `

`= 10/10 - 1/10 `

`=9/10`