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\(\frac{11}{132}=\frac{1}{12}\)
\(\frac{63}{91}=\frac{9}{13}\)
\(\frac{270}{450}=\frac{3}{5}\)
\(\frac{51}{680}=\frac{3}{40}\)
\(\frac{225}{315}=\frac{5}{7}\)
\(\frac{234}{1404}=\frac{1}{6}\)
\(\frac{11}{132}=\frac{11:11}{132:11}=\frac{1}{12}\)
\(\frac{63}{91}=\frac{63:7}{91:7}=\frac{9}{13}\)
\(\frac{270}{450}=\frac{270:90}{450:90}=\frac{3}{5}\)
\(\frac{51}{680}=\frac{51:17}{680:17}=\frac{3}{40}\)
\(\frac{225}{315}=\frac{225:45}{315:45}=\frac{5}{7}\)
\(\frac{234}{1404}=\frac{234:234}{1404:234}=\frac{1}{6}\)
1313/1717 = ( 1313 :101)/(1717:101)=13/17
171717/191919=(171717:10101)/(191919:10101)=17/19
231231/343343=(231231:7007)/(343343:7007)=33/49
373737/494949=(373737:10101)/(494949:10101)=37/49
1)
a)15/90 = 1/6, 120/600=1/5, 75/150=1/5 mau so chung=30
1/6=5/30
1/5=6/30
1/5=6/30
b)54/90=3/5, 180/288=5/8, 60/135=4/9
3/5=3*8*9/5*8*9=216/360
5/8=5*5*9/5*8*9=225/360
4/9=4*8*5/5*8*9=160/360
bai 2 ban tu lam di,mk met roi
Bài 1 :
\(\frac{22}{55}=\frac{22:11}{55:11}=\frac{2}{5}\)
\(\frac{63}{81}=\frac{63:9}{81:9}=\frac{7}{9}\)
Bài 2 :
\(\frac{3}{16}=\frac{3\times24\times56}{16\times24\times56}=\frac{4032}{21504}\)
\(\frac{5}{24}=\frac{5\times16\times56}{24\times16\times56}=\frac{4480}{21504}\)
\(\frac{21}{56}=\frac{21\times24\times16}{56\times24\times16}=\frac{8064}{21504}\)
Học tốt # ^-<
\(\frac{3}{9}=\frac{3:3}{9:3}=\frac{1}{3}\)
\(\frac{28}{40}=\frac{28:4}{40:4}=\frac{7}{10}\)
\(\frac{100}{200}=\frac{100:100}{200:100}=\frac{1}{2}\)
\(\frac{70}{75}=\frac{70:5}{75:5}=\frac{14}{15}\)
#hoctot
\(\frac{3}{9}=\frac{1}{3}\)
\(\frac{28}{40}=\frac{7}{10}\)
\(\frac{100}{200}=\frac{1}{2}\)
\(\frac{70}{75}=\frac{14}{15}\)
#Học tốt#
\(\frac{90}{75}=\frac{90:15}{75:15}=\frac{6}{5}\)
\(\frac{56}{63}=\frac{56:7}{63:7}\frac{8}{9}\)
\(\frac{632}{848}=\frac{632:8}{848:8}=\frac{79}{106}\)
Bài hơi dài. Mong bn thông cảm nha! Bn có thể giải 1 bài nào cũng được hoặc bn giải được hết thì càng tốt tại vì mk có nhiều bài khó mk cho luôn tổng thể vào để cho nhanh.
1
\(\frac{2}{12;}=\frac{1}{6}\)
\(\frac{42}{63}=\frac{1}{2}\)
\(\frac{5}{60}=\frac{1}{12}\)
2.
\(\frac{3}{4}=\frac{15}{12}\) số còn lại giữ nguyên
\(\frac{20}{5}=\frac{120}{30};\frac{7}{6}=\frac{35}{30}\)
\(\frac{1}{6}\) \(\frac{7}{9}\) \(\frac{1}{12}\)
\(\frac{5}{12}và\frac{9}{12}\) \(\frac{120}{30}và\frac{35}{30}\)
ta có : A=1/2+1/4+..+1/1024
=> A=1/21+1/22+..+1/210
=> A.2=(1/21+1/22+..+1/210).2
=> A.2=1+1/21+1/22+..+1/29
=> 2A-A=(1+1/21+1/22+..+1/29)-(1/21+1/22+..+1/210)
=> A=1-1/210
\(\frac{90}{100}=\frac{90:10}{100:10}=\frac{9}{10}\)
\(\frac{64}{128}=\frac{64:64}{128:64}=\frac{1}{2}\)
\(\frac{17}{51}=\frac{17:17}{51:17}=\frac{1}{3}\)
\(\frac{152}{608}=\frac{152:152}{608:152}=\frac{1}{4}\)
\(\frac{63}{315}=\frac{63:63}{315:63}=\frac{1}{5}\)