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\(\frac{1212}{1515}+\frac{1212}{3535}+\frac{1212}{6363}+\frac{1212}{9999}\)
\(=1212.\left(\frac{1}{1515}+\frac{1}{3535}+\frac{1}{6363}+\frac{1}{9999}\right)\)
Sau đó tự tính rồi làm típ nha
Study well
0,44 x (\(x+x\times\) 5 - \(\dfrac{23}{55}\)) + \(\dfrac{3}{14}\) x 2,24 = 1
0,44 x (\(x+x\times\)5 - \(\dfrac{23}{55}\)) + 0,48 = 1
0,44 x (\(x+x\times\) 5 - \(\dfrac{23}{55}\)) = 1 - 0,48
0,44 x (\(x+x\times5\) - \(\dfrac{23}{55}\)) = 0,52
\(x+x\times5\) - \(\dfrac{23}{55}\) = 0,52 : 0,44
\(x\) x (1 + 5) -\(\dfrac{23}{55}\) = \(\dfrac{13}{11}\)
\(x\) x 6 - \(\dfrac{66}{10}\) = \(\dfrac{13}{11}\) + \(\dfrac{23}{55}\)
\(x\) x 6 = \(\dfrac{65}{55}\) + \(\dfrac{23}{55}\)
\(x\times\) 6 = \(\dfrac{8}{5}\)
\(x\) x 6 = \(\dfrac{8}{5}\) : 6
\(x\) = \(\dfrac{4}{15}\)
Vậy \(x=\dfrac{4}{15}\)
Ta có : 1212/3535=12/35 ; 1212/9999=12/99
Từ đề bài => = 12/15 +12/35 +12/63 +12/99
= 6 x ( 2/15 + 2/35 +2/63+2/99 )
= 6 x ( 2/3x5 + ....+ 2/9x11)
= 6 x ( 1/3 - 1/5 +....+1/9 - 1/11)
= 6 x ( 1/3 - 1/11)
= 6 x 8/33 = 48/33
\(\dfrac{1212}{1515}+\dfrac{1212}{3535}+\dfrac{1212}{6363}+\dfrac{1212}{9999}\)
=\(\dfrac{12}{15}+\dfrac{12}{35}+\dfrac{12}{63}+\dfrac{12}{99}\)
=\(\dfrac{16}{11}\)
Giải:
\(\dfrac{1212}{1515}+\dfrac{1212}{3535}+\dfrac{1212}{6363}+\dfrac{1212}{9999}\)
\(=\dfrac{12}{15}+\dfrac{12}{35}+\dfrac{12}{63}+\dfrac{12}{99}\)
\(=12.\left(\dfrac{1}{3.5}+\dfrac{1}{5.7}+\dfrac{1}{7.9}+\dfrac{1}{9.11}\right)\)
\(=12.\dfrac{1}{2}.\left(\dfrac{2}{3.5}+\dfrac{2}{5.7}+\dfrac{2}{7.9}+\dfrac{2}{9.11}\right)\)
\(=6.\left(\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{11}\right)\)
\(=6.\left(\dfrac{1}{3}-\dfrac{1}{11}\right)\)
\(=6.\dfrac{8}{33}\)
\(=\dfrac{16}{11}\)
1212/3030=1212:303/3030:303=4/10
32032/48048=32032:2002/48048:2002=16/21
456456/234234=456456:6006/234234:6006=76/39
16161616/38383838=16161616:2020202/38383838:2020202=8/19
= \(\frac{12}{15}\) +\(\frac{12}{35}\)+\(\frac{12}{63}\)+\(\frac{12}{99}\)
= 12 x (\(\frac{1}{15}\)+\(\frac{1}{35}\)+\(\frac{1}{63}\)+\(\frac{1}{99}\))
= 12 x ( \(\frac{1}{3x5}\)+\(\frac{1}{5x7}\)+\(\frac{1}{7x9}\)+\(\frac{1}{9x11}\))
= 12 x \(\frac{1}{2}\) x ( \(\frac{1}{3}\)-\(\frac{1}{5}\)+\(\frac{1}{5}\)-\(\frac{1}{7}\)+\(\frac{1}{7}\)-\(\frac{1}{9}\)+\(\frac{1}{9}\)-\(\frac{1}{11}\))
= 6 x ( \(\frac{1}{3}\) - \(\frac{1}{11}\))
= 6 x \(\frac{8}{33}\)
= \(\frac{48}{33}\)=\(\frac{16}{11}\)
Nhớ tk nha
Ta có:
\(\hept{\begin{cases}\frac{1212}{1515}=\frac{4}{5}+\frac{1}{5}=1\\\frac{5151}{6868}=\frac{3}{4}+\frac{1}{4}=1\end{cases}}\)
Vì \(\frac{1}{5}< \frac{1}{4}\)
Nên \(\frac{1212}{1515}>\frac{5151}{6868}\)
Vậy...
tk mk nha bn
1212+1=1213
Tk cho mk nha! Thanks