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em muốn nhanh thì lần sau em tách câu hỏi ra chứ đừng hỏi nhiều trong một câu em nhé
\(\dfrac{12}{48}\) = \(\dfrac{12:12}{48:12}=\) \(\dfrac{1}{2}\) \(\dfrac{49}{140}\) = \(\dfrac{49:7}{140:7}\) = \(\dfrac{7}{20}\)
\(\dfrac{125}{1000}\) = \(\dfrac{125:125}{1000:125}\) = \(\dfrac{1}{8}\) \(\dfrac{352}{253}\) = \(\dfrac{352:11}{253:11}\)= \(\dfrac{32}{23}\)
\(\dfrac{75}{300}=\) \(\dfrac{75:75}{300:75}\) = \(\dfrac{1}{4}\) \(\dfrac{561}{132}\) = \(\dfrac{561:33}{132:33}\) = \(\dfrac{17}{4}\)
a. \(\frac{34}{50}=\frac{2\times17}{2\times25}=\frac{17}{25}\); \(\frac{48}{68}=\frac{4\times12}{4\times17}=\frac{12}{17}\); \(\frac{1313}{2323}=\frac{101\times13}{101\times23}=\frac{13}{23}\); \(\frac{515151}{636363}=\frac{10101\times51}{10101\times63}=\frac{51}{63}\)
b. +) \(\frac{3}{15}=\frac{3}{3\times5}=\frac{1}{5}\); \(\frac{33}{44}=\frac{3\times11}{4\times11}=\frac{3}{4}\); \(\frac{2}{8}=\frac{2}{2\times4}=\frac{1}{4}\)
Mẫu chung: 20
\(\frac{1}{5}=\frac{1\times4}{5\times4}=\frac{4}{20}\); \(\frac{3}{4}=\frac{3\times5}{4\times5}=\frac{15}{20}\); \(\frac{1}{4}=\frac{1\times5}{4\times5}=\frac{5}{20}\)
+) \(\frac{9}{12}=\frac{3\times3}{4\times3}=\frac{3}{4}\); \(\frac{24}{36}=\frac{12\times2}{12\times3}=\frac{2}{3}\); \(\frac{3}{8}=\frac{3}{8}\)
Mẫu chung : 24
\(\frac{3}{4}=\frac{3\times6}{4\times6}=\frac{18}{24}\); \(\frac{2}{3}=\frac{2\times8}{3\times8}=\frac{16}{24}\); \(\frac{3}{8}=\frac{3\times3}{8\times3}=\frac{9}{24}\).
c1
a,3/15 = 3:3/15:3 = 15
33/44 = 33:11/44:11 = 34
2/8 = 2:2/8:2 = 1/4
b,9/12 =9:3/12:3 = 34
24/36 =24:12/36:12 = 23
3/8 = 3:1/8:1 = 3/8
c2
a) =12x(4+6)/24
= 12x10/24
=120/24
=5
b,16x8-16x2/12x4
=16x(8-2)/48
=16x6/48
=2
c3
5/8=45/72
20/15=4/3=96/72
24/32=3/4=54/72
15/18=5/6=60/72
77/99=7/9=56/72
c4
2/3=2/3
12/15=4/5
24/18=4/3
16/48=1/3
75/100=3/4
30/45=2/3
12/36=1/3
20/15=4/3
các phân số lớn hơn 1 luôn có mẫu số bé hơn tử số
vậy các số lớn hơn 1 là 24/18,20/15
k mk nha thank mọi ng'
a, \(\frac{3}{15}=\frac{1}{5}=\frac{4}{20}\); \(\frac{33}{44}=\frac{3}{4}=\frac{15}{20}\); \(\frac{2}{8}=\frac{1}{4}=\frac{5}{20}\)
b, \(\frac{9}{12}=\frac{3}{4}=\frac{18}{24}\); \(\frac{24}{36}=\frac{2}{3}=\frac{16}{24}\); \(\frac{3}{8}=\frac{9}{24}\)
Bài 2 :
a,\(\frac{12x4+12x6}{24}=\frac{12x\left(4+6\right)}{24}=\frac{1x10}{2}=\frac{10}{2}=\frac{5}{1}\)
b, \(\frac{16x8-16x2}{12}=\frac{16x\left(8-2\right)}{12}=\frac{8x6}{6}=\frac{8}{1}\)
\(\dfrac{3}{2}v\text{à}\dfrac{5}{8}\\ MSC:8\\ \dfrac{3}{2}=\dfrac{3\times4}{2\times4}=\dfrac{18}{8};\dfrac{5}{8}\\ \dfrac{1}{3}v\text{à}\dfrac{4}{5}\\ MSC:15\\ \dfrac{1}{3}=\dfrac{1\times5}{3\times5}=\dfrac{5}{15};\dfrac{4}{5}=\dfrac{4\times3}{5\times3}=\dfrac{12}{15}\\ \dfrac{3}{4}v\text{à}\dfrac{9}{24}\\ MSC:24\\ \dfrac{3}{4}=\dfrac{3\times6}{4\times6}=\dfrac{18}{24}\)
a: 3/2=12/8
5/8=5/8
b: 1/3=5/15
4/5=12/15
c: 3/4=18/24
9/24=9/24
Quy đồng mẫu số: 1/2 ; 2/3 và 3/5
MSC: 30
Quy đồng:
1/2 = 1x15/2x15 = 15/30
2/3 = 2x10/3x10 = 20/30
3/5 = 3x6/5x6 = 18/30
MSC :30
=> \(\frac{1x15}{2x15}\text{=}\frac{15}{30};\frac{2x10}{3x10}\text{=}\frac{20}{30};\frac{3x6}{5x6}\text{=}\frac{18}{30}\)
\(a,\dfrac{3}{9}=\dfrac{1}{3}\\ \dfrac{16 }{24}=\dfrac{2}{3}\\ b,\dfrac{17}{51}=\dfrac{1}{3}=\dfrac{5}{15}\\ \dfrac{18}{90}=\dfrac{1}{5}=\dfrac{3}{15}\\ c,\dfrac{5}{10}=\dfrac{1}{2}=\dfrac{3}{6}\\ \dfrac{15}{45}=\dfrac{1}{3}=\dfrac{2}{6}\\ d,\dfrac{42}{63}=\dfrac{2}{3}=\dfrac{6}{9}\\ \dfrac{64}{72}=\dfrac{8}{9}\)
\(\frac{3}{15}\)= \(\frac{3:3}{15:3}\) = \(\frac{1}{5}\)
\(\frac{33}{44}\)= \(\frac{33:11}{44:11}\)= \(\frac{3}{4}\)
\(\frac{2}{8}\)= \(\frac{2:2}{8:2}\)= \(\frac{1}{4}\)
\(\frac{1}{5}\)= \(\frac{1\times4}{5\times4}\)= \(\frac{4}{20}\)
\(\frac{3}{4}\)=\(\frac{3\times5}{4\times5}\)= \(\frac{15}{20}\)
\(\frac{1}{4}\)= \(\frac{1\times5}{4\times5}\)= \(\frac{5}{20}\)
\(\frac{9}{12}\)=\(\frac{9:3}{12:3}\) = \(\frac{3}{4}\)
\(\frac{24}{36}\)=\(\frac{24:12}{36:12}\)= \(\frac{2}{3}\)
\(\frac{3}{8}\)= \(\frac{3:1}{8:1}\)= \(\frac{3}{8}\)
\(\frac{3}{4}\)=\(\frac{3\times6}{4\times6}\)= \(\frac{18}{24}\)
\(\frac{2}{3}\)=\(\frac{2\times8}{3\times8}\)=\(\frac{16}{24}\)
\(\frac{3}{8}\)= \(\frac{3\times3}{8\times3}\)=\(\frac{9}{24}\)
3/15= 1/5; 33/44=3/4; 2/8= 1/4
1/5= 1x 4/ 5x4= 4/20; 3/4= 3x 5/ 4x 5= 15/20; 1/4= 1x 5/ 4x 5= 5/20
9/12= 3/4; 24/36= 2/3; 3/8 không rút gọn được
3/4= 3x 6/ 4x6= 18/24; 2/3= 2x 8/ 3x 8= 16/24; 3/8= 3x 3/ 8x 3= 9/24