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+....... = 1 là: A.2/5 B.3/5 C.4/5 D. 1/5
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, \(\frac{16x8-16x2}{12}=\frac{16x\left(8-2\right)}{12}=\frac{8x6}{6}=\frac{8}{1}\)
\(a,\dfrac{52}{32}=\dfrac{13}{8}\\ \dfrac{55}{65}=\dfrac{11}{13}\\ MSC:104\\ =>\dfrac{13}{8}=\dfrac{13.13}{8.13}=\dfrac{169}{104}\\ \dfrac{11}{13}=\dfrac{11.8}{13.8}=\dfrac{88}{104}\)
\(b,\dfrac{72}{64}=\dfrac{9}{8}\\ \dfrac{54}{81}=\dfrac{2}{3}\\ MSC:24\\ \dfrac{9}{8}=\dfrac{9.3}{8.3}=\dfrac{27}{24}\\ \dfrac{2}{3}=\dfrac{2.8}{3.8}=\dfrac{16}{24}\\ c,\dfrac{24}{36}=\dfrac{2}{3}\\ \dfrac{12}{30}=\dfrac{2}{5}\\ MSC:15\\ \dfrac{2}{3}=\dfrac{2.5}{3.5}=\dfrac{10}{15}\\ \dfrac{2}{5}=\dfrac{2.3}{3.5}=\dfrac{6}{15}\)
\(d,\dfrac{80}{40}=2\\ \dfrac{45}{63}=\dfrac{5}{7}\\ MSC:7\\ 2=\dfrac{14}{7}\\ e,\dfrac{150}{50}=3\\ \dfrac{100}{200}=\dfrac{1}{2}\\ MSC:2\\ 3=\dfrac{6}{2}\\ f,\dfrac{54}{81}=\dfrac{2}{3}\\ \dfrac{69}{93}=\dfrac{23}{21}\\ MSC:21\\ \dfrac{2}{3}=\dfrac{2.7}{3.7}=\dfrac{14}{21}\)
\(a.\dfrac{52}{32}\text{=}\dfrac{13}{8};\dfrac{55}{65}\text{=}\dfrac{11}{13}\)
\(\dfrac{13.13}{13.8}\text{=}\dfrac{169}{104};\dfrac{11.8}{13.8}\text{=}\dfrac{88}{104}\)
\(c.\dfrac{24}{36}\text{=}\dfrac{2}{3};\dfrac{12}{30}\text{=}\dfrac{2}{5}\)
\(\dfrac{2.5}{3.5}\text{=}\dfrac{10}{15};\dfrac{2.3}{5.3}\text{=}\dfrac{6}{15}\)
\(b.\dfrac{72}{64}\text{=}\dfrac{9.3}{8.3}\text{=}\dfrac{27}{24};\dfrac{54}{81}\text{=}\dfrac{2.8}{3.8}\text{=}\dfrac{16}{24}\)
\(d.\dfrac{80}{40}\text{=}\dfrac{2.63}{63}\text{=}\dfrac{126}{63};\dfrac{45}{63}\)
\(e.\dfrac{150}{50}\text{=}\dfrac{3.2}{2}\text{=}\dfrac{6}{2};\dfrac{100}{200}\text{=}\dfrac{1}{2}\)
\(f.\dfrac{54}{81}\text{=}\dfrac{2.31}{3.31}\text{=}\dfrac{62}{93};\dfrac{69}{93}\)
b: 12/20+6/18=3/5+1/3=9/15+5/15=14/15
c: 8/12+20/30=2/3+2/3=4/3
d: 10/12+12/36=5/6+2/6=7/6
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) \(\dfrac{5}{10}-\dfrac{2}{15}\)
\(=\dfrac{1}{2}-\dfrac{2}{15}\)
\(=\dfrac{15}{30}-\dfrac{4}{30}\)
\(=\dfrac{11}{30}\)
B)\(\dfrac{5}{20}-\dfrac{1}{6}\)
\(=\dfrac{1}{4}-\dfrac{1}{6}\)
\(=\dfrac{6}{24}-\dfrac{4}{24}\)
\(=\dfrac{2}{24}=\dfrac{1}{12}\)
C) \(\dfrac{6}{18}-\dfrac{6}{24}\)
\(=\dfrac{1}{3}-\dfrac{1}{4}\)
\(=\dfrac{4}{12}-\dfrac{3}{12}\)
\(=\dfrac{1}{12}\)
D) \(\dfrac{5}{9}-\dfrac{3}{12}\)
\(=\dfrac{5}{9}-\dfrac{1}{4}\)
\(=\dfrac{20}{36}-\dfrac{9}{36}\)
\(=\dfrac{11}{36}\).
a: =1/2-2/15
=15/30-4/30
=11/30
b: =1/4-1/6
=3/12-2/12
=1/12
c: =1/3-1/4
=1/12
d: =20/36-9/36
=11/36
A, 3/9 + 9/15 + 8/12
= 1/3 + 9/15 + 2/3
= 8/5
B, 4/10 + 12/32 + 9/15
= 2/5 + 3/8 + 9/15
= 11/8
a) Ta có:
`9/12=(9:3)/(12:3)=3/4`
`20/32=(20:4)/(32:4)=5/8`
Mẫu số chung: 8
`3/4=(3×2)/(4×2)=6/8`
b) Ta có:
`18/12=(18:6)/(12:6)=3/2`
`20/32=(20:4)/(32:4)=5/8`
Mẫu số chung: 8
`3/2=(3×4)/(2×4)=12/8`