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( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x ( 1212 x 27 - 2727 x 12 )
= ( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x ( 32724 -32724 )
= ( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x 0
= 0
a) \(\frac{1212}{1515}\):\(\frac{2727}{2525}\)
= \(\frac{1212}{1515}\)* \(\frac{2525}{2727}\)
= \(\frac{101.12}{101.15}\)* \(\frac{101.25}{101.27}\)
= \(\frac{12}{15}\). \(\frac{25}{27}\)
= \(\frac{20}{27}\)
b) ban co the viet ro hon de bai dc ko?
2727:27+99
=101+99
=200
ai tick cho tớ đầu tiên thì báo tớ tớ tick lại cho!
\(\dfrac{2727}{3131}=\dfrac{27.101}{31.101}=\dfrac{27}{31}\)
⇒\(\dfrac{27}{31}=\dfrac{2727}{3131}\)
\(\dfrac{27}{31}=\dfrac{27\times101}{31\times101}=\dfrac{2727}{3131}\)
Ta có :
\(\frac{5}{8}+\frac{7}{12}:4=\frac{5}{8}+\frac{7}{12}.\frac{1}{4}=\frac{5}{8}+\frac{7}{48}=\frac{30}{48}+\frac{7}{48}=\frac{37}{48}.\)
\(\frac{2}{3}-\frac{353535}{717171}.\frac{7171}{7070}\)
\(=\frac{2}{3}-\frac{353535.7171}{717171.7070}\)
\(=\frac{2}{3}-\frac{50505.101}{10101.1010}\)
\(=\frac{2}{3}-\frac{10101.5.101}{10101.1010}\)
\(=\frac{2}{3}-\frac{5.101}{1010}\)
\(=\frac{2}{3}-\frac{5.101}{2.5.101}\)
\(=\frac{2}{3}-\frac{1}{2}=\frac{4}{6}-\frac{3}{6}=\frac{1}{6}\)
a)\(\frac{27}{5}\text{x}\frac{91}{12}\text{x}\frac{125}{9}\text{x}\frac{96}{13}=\frac{27}{9}\text{x}\frac{91}{13}\text{x}\frac{125}{5}\text{x}\frac{96}{12}=3\text{x}7\text{x}25\text{x}8\)
Đến đây tự tính nha !
b)\(\frac{2539}{35}\text{x}\frac{7}{90}+\frac{561}{35}\text{x}\frac{7}{90}=\frac{7}{90}\text{x}\left(\frac{2539}{35}+\frac{561}{35}\right)=\frac{7}{90}\text{x}\frac{3100}{35}=\frac{3100}{90}\text{x}\frac{7}{35}=\frac{310}{9}\text{x}\frac{1}{5}=\frac{62}{9}\)
a) = 17/19 - 17/19 + 27/35 + 35/35 = 0 + 62/35
b) = 1/3 x 4/5 + 1/3 x6/5 + 1/3 x 2 = 1/3(4/5 + 6/5 + 2) = 1/3 x 4 = = 4/3
c) 4/7 x 2/9 + 4/7 x 7/9 + 2/3 = 4/7 x (2/9 + 7/9) + 2/3 = 4/7 x 1 + 2/3 = 26/21
A) 17/19 - 17/19 + 27/35 + 35/35 = 0 + 62/35
B) 1/3 x 4/5 + 1/3 x 6/5 + 1/3 x 2 = 1/3 x(4/5 + 6/5 x 2 ) = 1/3 x 4 = 4/3
c) TƯƠNG TỰ CÂU A VÀ B
* HOKTOT*
NHA
`27/35 xx ( 7070/2727 - 7/9)`
`=27/35 xx (70/27 - 7/9)`
`=27/35 xx ( 70/27 - 21/27)`
`=27/35 xx 49/27`
\(=\dfrac{27.49}{35.27}\)
\(=\dfrac{1.7}{5.1}\)
`=7/5`