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_ \(\frac{7}{9}=\frac{7\times11}{9\times11}=\frac{7\times111}{9\times111}\Rightarrow\frac{7}{9}=\frac{77}{99}=\frac{777}{999}\)
_ \(\frac{13}{15}=\frac{13\times101}{15\times101}=\frac{13\times10101}{15\times10101}\Rightarrow\frac{13}{15}=\frac{1313}{1515}=\frac{131313}{151515}\)
_ \(\frac{20172017}{20072007}=\frac{20172017:10001}{20072007:10001}\Rightarrow\frac{20172017}{20072007}=\frac{2017}{2007}\)
_ \(\frac{123123}{456456}=\frac{123123:1001}{456456:1001}\Rightarrow\frac{123123}{456456}=\frac{123}{456}\)
~ Ủng hộ mk nha!~
A=\(\dfrac{1313}{2121}\)*\(\dfrac{165165}{143143}\)*\(\dfrac{424242}{151515}\)
A=\(\dfrac{13}{3\cdot7}\)*\(\dfrac{3\cdot5}{13}\)*\(\dfrac{2\cdot7}{5}\)
A=\(\dfrac{13}{21}\)*\(\dfrac{15}{13}\)*\(\dfrac{14}{5}\)
A=\(\dfrac{13\cdot3\cdot5\cdot2\cdot7}{3\cdot7\cdot13\cdot5}\)
A= 2
1313/2121 x 165165/143143 x 424242/151515
= 13/21 x 15/13 x 14/5
= 2
Hok tốt nha !~
1313/2121 x 165165/143143 x 424242/151515
=13/21 x 165/143 x42/15
=2
Rút gọn là sẽ xong, ko khó đâu
\(\frac{1313}{2121}\times\frac{165165}{143143}\times\frac{424242}{151515}=\frac{13}{21}\times\frac{165}{143}\times\frac{42}{15}=\frac{13\times165\times42}{21\times143\times15}\)
\(=\frac{13\times15\times11\times21\times2}{21\times13\times11\times15}=2\)
dễ mak duy = \(\frac{13}{45}\)
- CHO ANH K NHA!!!!!!!!!!!!!!!
\(\frac{123123}{456456}=\frac{123123:303}{456456:303}=\frac{41}{152}\)
/HT\
Rút gọn
\(\frac{1313}{2727}=\frac{13\cdot101}{27\cdot101}=\frac{13}{27}\)
\(\frac{151515}{232323}=\frac{15\cdot10101}{23\cdot10101}=\frac{15}{23}\)
\(\frac{123123}{456456}=\frac{123\cdot1001}{456\cdot1001}=\frac{123}{456}=\frac{41\cdot3}{152\cdot3}=\frac{41}{152}\)
hok tốt
==.== mk làm vậy thôi , nếu sai thì thông cảm cho mk nha ...