a,A,C,D

b,C

a) Câu A;D

b) Câu C

4\(\dfrac{1}{2}\)=4,5      3\(\dfrac{4}{5}\)=3,8         2\(\dfrac{3}{4}\)=2,75      1\(\dfrac{12}{25}\)=1,48.

4 1/2=4,5

3 4/5=3,8

2 3/4=2,75

1 12/25=1,48

đúng 100% nha

\(4\dfrac{1}{2}\)=4\(\dfrac{5}{10}\)=4,5

\(3\dfrac{4}{5}\)=3\(\dfrac{8}{10}\)=3,8

\(2\dfrac{3}{4}\)=2\(\dfrac{75}{100}\)=2,75

1\(\dfrac{12}{25}\)=1\(\dfrac{48}{100}\)=1,48

4/5=0,8

7/2=3,5

9/4=2,25

9/25=0,36

\(\dfrac{4}{5}=0,8\)

\(\dfrac{7}{2}=3,5\)

\(\dfrac{9}{4}=2,25\)

\(\dfrac{9}{25}=0,36\)

0,8 ; 3,5 ; 2,25 ; 0,36

4\(\dfrac{1}{2}\) = 4+0,5 = 4,5

4\(\dfrac{1}{2}\) = \(\dfrac{9}{2}\) = 4,5

3\(\dfrac{4}{5}\) = 3+0,8 = 3,8

3\(\dfrac{4}{5}\) = \(\dfrac{19}{5}\) = 3,8

2\(\dfrac{3}{4}\) = 2 + 0,75 = 2,75

2\(\dfrac{3}{4}\) = \(\dfrac{11}{4}\) = 2,75

1\(\dfrac{12}{25}\) = 1 + \(0,48\) = 1,48

1\(\dfrac{12}{25}\) = \(\dfrac{37}{25}\) = 1,48

41221​ = 4+0,5 = 4,5

41221​ = 9229​ = 4,5

34554​ = 3+0,8 = 3,8

34554​ = 195519​ = 3,8

23443​ = 2 + 0,75 = 2,75

23443​ = 114411​ = 2,75

112252512​ = 1 + $0,48$ = 1,48

112252512​ = 37252537​ 

36,23

54,07

12,254

36,23

54,07

12,254

36,23;54,07;12,254

1. 8/23;-25;0
2.29/11;-1 và -3/2
3.3+1/2;-3+4/7
4.-12/7;19/8
đúng thì mik nha

\(\frac{7}{41}=0,17...;\frac{25}{108}=0,23...,\frac{17}{25}=0,68\) 

\(\frac{4}{23}=0,173....\)

148/100 nhé

cảm ơn bạn

=\(\frac{37}{25}\) nha bn

4 1/2 = 4 x 2+1/2 = 9/2

3 4/5 = 3 x 5+4/5 = 19/5

2 3/4 = 2 x 4+3/4 = 11/4

1 12/25 = 1 x 25+12/25 = 37/25

Tk mk nha

mk cho bài kham khảo nha :

\(4\frac{1}{2}=\frac{9}{2}=4,5\)

\(3\frac{4}{5}=\frac{19}{5}=3,8\)

\(2\frac{3}{4}=\frac{11}{4}=2,75\)

\(1\frac{12}{25}=\frac{37}{25}=1,48\)

ok k mk nha

Bài làm :

4\(\frac{1}{2}\)= \(\frac{9}{2}\)

3\(\frac{4}{5}\)= \(\frac{19}{5}\)

2\(\frac{3}{4}\)=\(\frac{11}{4}\)

1\(\frac{12}{25}\)=\(\frac{37}{25}\)