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\(\frac{123}{12}=10\frac{1}{4}\)
\(\frac{25}{3}=8\frac{1}{3}\)
\(\frac{7}{4}=1\frac{3}{4}\)
a)
\(\dfrac{1}{2}=0,5;\dfrac{3}{4}=0,75;\dfrac{7}{5}=1,4;\dfrac{9}{8}=1,125;\dfrac{26}{25}=1,04;\dfrac{120}{125}=0,96\)
b)
\(\dfrac{15}{25}=0,6;\dfrac{75}{25}=3;\dfrac{90}{300}=0,3;\dfrac{27}{36}=0,75;\dfrac{51}{85}=0,6\)
a,1/2=5/10;3/4=75/100;7/5=140/100;26/25=108/100;120/125=960/1000
b,15/25=60/100;75/25=300/100;90/300=3/10;27/36=3/4=75/100;
51/85=3/5=60/100;39/65=3/5=60/100
a) \(\frac{15}{10}=1,5\) \(\frac{675}{10}=6,75\) \(\frac{7}{10}=0,7\)
\(\frac{79}{100}=0,79\) \(\frac{5}{100}=0,05\) \(\frac{67}{100}=0,67\)
b) \(\frac{1}{2}=1\div2=0,5\) \(\frac{3}{4}=3\div4=0,75\)
\(\frac{15}{8}=15\div8=1,875\) \(\frac{7}{25}=7\div25=0,28\)
\(\frac{19}{30}=19\div30=0,63\) \(\frac{21}{125}=21\div125=0,168\)
\(\frac{14}{3}=4+\frac{2}{3}=4\frac{2}{3}\) \(\frac{25}{4}=6+\frac{1}{4}=6\frac{1}{4}\)
\(\frac{1000}{30}=\frac{100}{3}=33+\frac{1}{3}=33\frac{1}{3}\)
\(\frac{92}{7}=13+\frac{1}{7}=13\frac{1}{7}\) \(\frac{10845}{46}=235+\frac{35}{46}=235\frac{35}{46}\)
\(\frac{1000}{4}=250\) \(\frac{13}{3}=4+\frac{1}{3}=4\frac{1}{3}\)
a, 14/15
14: 15 = 0 dư 14
chuyển thành 0 và 14/15
29/7
29 : 7 = 4 dư 1
chuyển thành 4 và 1/7
100/24 = 4 và 4/24
32/7 = 4 và 4/7
315/100 = 3 và 15/100
còn lại tương tự
15 \(\frac{27}{25}\)bằng\(\frac{402}{25}\)
7\(\frac{33}{201}\)bằng\(\frac{1440}{201}\)
\(\frac{2007}{135}\)=14\(\frac{117}{135}\)
\(\frac{17}{12}\)=1\(\frac{5}{12}\)
\(\frac{126}{27}\)=4\(\frac{18}{27}\)
\(\frac{311}{39}\)=7\(\frac{38}{39}\)
a) \(15\frac{27}{25}\)=\(\frac{402}{25}\);\(7\frac{31}{201}\)=\(\frac{1438}{201}\)
b)\(\frac{2007}{135}=14\frac{13}{15}\);\(\frac{17}{12}=1\frac{5}{12}\);\(\frac{126}{27}=4\frac{2}{3}\);\(\frac{311}{39}=7\frac{38}{39}\)
\(\frac{31}{4}=7\frac{3}{4}\)
\(\frac{25}{3}=8\frac{1}{3}\)
\(\frac{36}{5}=7\frac{1}{5}\)
\(\frac{78}{21}=3\frac{5}{7}\)
\(\frac{65}{23}=2\frac{19}{23}\)
Bài 4
35/85 = 7/17
36/108 = 1/3
25/100 = 1/4
39/52 = 3/4
Bài 8
a) 9/8 và 7/12
= 8×3=24 ; 12×2=24
=>9/8 =27/24
=> 7/12 ; 14/24
b) 3/20 và 4/15
=20×3=60 ; 15×4=60
=> 9/60 ; 16/60
Bài 9
a) \(\frac{3}{8},\frac{15}{8},\frac{9}{8},\frac{7}{8}\)
Từ lớn -> bé:
=>\(\frac{15}{8},\frac{9}{8},\frac{7}{8},\frac{3}{8}\)
b) \(\frac{4}{15},\frac{3}{5},\frac{8}{45},\frac{7}{15}=\frac{12}{45},\frac{27}{45},\frac{8}{45},\frac{21}{45}\)
Từ lớn -> bé:
=> \(\frac{3}{5},\frac{7}{15},\frac{4}{15},\frac{8}{45}\)
c) \(\frac{3}{8},\frac{4}{5},\frac{47}{40},\frac{9}{4}=\frac{15}{40},\frac{32}{40},\frac{47}{40},\frac{90}{40}\)
Từ lớn -> bé:
=>\(\frac{9}{4},\frac{47}{40},\frac{4}{5},\frac{3}{8}\)
Bài 10
a, Ta có
`x/15 < 4/15`
` <=> x < 4`
` <=> x ∈ {1 ; 2 ; 3}`
b, Ta có
`5/9 > x/9`
` <=> 5 > x`
` <=> x ∈ {1 ; 2 ; 3 ; 4}`
c, Ta có
`1 <x/8 < 11/8`
` <=> 8/8 < x/8 < 11/8`
` <=> 8 < x <11`
` <=> x ∈ {9 ; 10}`
\(\frac{15}{3}=5;\frac{25}{4}=6\frac{1}{4};\frac{36}{7}=5\frac{1}{7};\frac{45}{7}=6\frac{3}{7};\frac{25}{3}=8\frac{1}{3};\frac{14}{12}=1\frac{2}{12}=1\frac{1}{6}\)