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Tk mình đi mọi người mình bị âm nè!
Ai tk mình mình tk lại cho!
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\(\frac{17}{23}=\frac{1717}{2323}\)vì
\(\frac{17}{23}\times\frac{101}{101}=\frac{1717}{2323}\)
1717 / 2323 = (17 x 101) / (23 x 101) = 17/23
Suy ra 17/23 = 1717/2323
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\(A=\frac{17}{19}x\frac{1}{6}+\frac{17}{19}x\frac{5}{6}\)
\(=\frac{17}{19}x\left(\frac{1}{6}+\frac{5}{6}\right)=\frac{17}{19}x1=\frac{17}{19}\)
A= \(\frac{1717}{1919}\text{ *}\frac{303}{1818}+\frac{17}{19}\text{ *}\frac{1515}{1818}\)
A= \(\frac{17}{19}\text{ *}\frac{3}{18}+\frac{17}{19}\text{ *}\frac{15}{18}\)
A= \(\frac{17}{19}\text{ *}\left(\frac{3}{18}+\frac{15}{18}\right)\)
A= \(\frac{17}{19}\text{ *}1\)
A= \(\frac{17}{19}\)
Vậy A= \(\frac{17}{19}\)
vVv Học tốt nhé bạn, mình sẽ rất vui nếu bạn k đúng cho mình, cảm ơn ban nhiều vVv
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\(\dfrac{1212}{1313}\) = \(\dfrac{1212:101}{1313:101}\) = \(\dfrac{12}{13}\)
Vậy hai phân số đã cho đã được quy đồng thành:
\(\dfrac{12}{13}\) và \(\dfrac{12}{13}\)
\(\dfrac{12}{13}\) giữ nguyên
\(\dfrac{1212}{1313}=\dfrac{1212:101}{1313:101}=\dfrac{12}{13}\)
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a) 15/3 x 7/5 + 7/5 x 10/3 + 7/5
= (15/3 + 10/3 + 1) x 7/5
= 28/3 x 7/5
= 196/15
c) 2009 + 3567 + 6433 - 1009
= (2009 - 1009 ) + (3567 + 6433)
= 1000 + 10000
= 11000
\(\frac{15}{3}\)x\(\frac{7}{5}+\frac{7}{5}\)x\(\frac{10}{3}+\frac{7}{5}\)
= \(\frac{15}{3}\)x \(\frac{7}{5}+\frac{7}{5}\)x \(\frac{10}{3}+\frac{7}{5}x1\)
=\(\left(\frac{15}{3}+\frac{10}{3}+1\right)\)x \(\frac{7}{5}\)
= \(\frac{100}{3}\)x \(\frac{7}{5}\)
=\(\frac{140}{3}\)
\(\frac{1212}{1717}\)x \(\frac{165165}{132132}\)x\(\frac{515151}{515151}\)
= \(\frac{12}{17}\)x \(\frac{165}{132}\)x \(\frac{51}{51}\)
= \(\frac{12}{17}\)x\(\frac{165}{132}\)x 1
= \(\frac{165}{187}\)
2009 + 3567 + 6433 - 1009
= ( 2009 - 1009 ) + (3567 +6433 )
=1000 + 10000
= 11000
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Ta có: \(\frac{1212}{1515}=\frac{12}{15}\)
=>\(\frac{12}{15}=\frac{1212}{1515}\)
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\(\frac{1212}{4343}\cdot\frac{868686}{545454}\cdot\frac{27}{12}=\frac{12}{43}\cdot\frac{43}{27}\cdot\frac{9}{4}=\frac{12\cdot43\cdot9}{43\cdot27\cdot4}=\frac{3\cdot1}{3\cdot1}=1\)
1212/1717=12/17
Vì 12/17=12.101/17.101=1212/1717
1212/1717=12/17
vì 1212:101/1717:101=12/17
tk nha