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2 x 17 x 12 + 4 x 6 x 21 + 8 x 3 x 62
= 24 x 17 + 24 x 21 + 24 x 62
= 24 x (17 + 21 + 62)
= 24 x 100
= 2400
2 x 17 x 12 + 4 x 6 x 21 + 8 x 3 x 62
= 2 x 12 x 17 + 24 x 21 + 24 x 62
= 24 x 17 + 24 x 21 + 24x 62
= 24 x ( 17 + 21 + 62)
= 24 x 100
= 2400
\(=\dfrac{29}{13}\cdot\dfrac{13}{29}\cdot4\cdot\dfrac{21}{8}\cdot\dfrac{8}{21}=4\)
A ) 2/17 + 30/46 + 15/17 + 4/49 + 8/23=102/49
B ) 5/8 x ( 19/31 x 8/5 )=19/31
C ) 7/9 x 8/15 x 9/7 x 15/4=2
D ) 11/12 x 24/7 x 21/22=3
nhìu quá nên mk chỉ cho kết quả thôi nha ^-^!!!
\(\dfrac{1}{7}\times\dfrac{21}{8}-\dfrac{3}{8}\times\dfrac{1}{7}-\dfrac{1}{7}\times\dfrac{2}{8}\\ =\dfrac{1}{7}\times\left(\dfrac{21}{8}-\dfrac{3}{8}-\dfrac{2}{8}\right)\\ =\dfrac{1}{7}\times\dfrac{16}{8}\\ =\dfrac{1}{7}\times2\\ =\dfrac{2}{7}\)
\(\dfrac{1}{7}\times\dfrac{21}{8}-\dfrac{3}{8}\times\dfrac{1}{7}-\dfrac{1}{7}\times\dfrac{2}{8}\)
=\(\dfrac{1}{7}\times\left(\dfrac{21}{8}-\dfrac{3}{8}-\dfrac{2}{8}\right)\)
=\(\dfrac{1}{7}\times2\)
=\(\dfrac{2}{7}\)
tính trừ bt nha bạn vế thương thì cũng tĩnh ra xong mới tính nha
a, \(x\) + \(\dfrac{1}{4}\) - \(\dfrac{3}{8}\) = \(\dfrac{7}{12}\)
\(x\) - \(\dfrac{1}{8}\) = \(\dfrac{7}{12}\)
\(x\) = \(\dfrac{7}{12}\) + \(\dfrac{1}{8}\)
\(x\) = \(\dfrac{17}{24}\)
\(x\) x 5 + \(x\) : 4 x 8 + \(x\)= 21 x 64
\(x\) x 5 + \(x\) x 2 + \(x\) = 1344
\(x\) x (5 + 2 + 1) = 1344
\(x\) x 8 = 1344
Ai k mk mk k lại gấp đôi!
x = 168
\(\dfrac{x}{4}+\dfrac{x}{8}+x:2=\dfrac{21}{8}\\ x\times\left(\dfrac{1}{8}+\dfrac{1}{4}+\dfrac{1}{2}\right)=\dfrac{21}{8}\\ x\times\dfrac{7}{8}=\dfrac{21}{8}\\ x=3.\)
\(\dfrac{x}{4}\) + \(\dfrac{x}{8}\) + \(\dfrac{x}{2}\) = \(\dfrac{21}{8}\)
\(x\) \(\times\) ( \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{2}\)) = \(\dfrac{21}{8}\)
\(x\) \(\times\) \(\dfrac{7}{8}\) = \(\dfrac{21}{8}\)
\(x\) = \(\dfrac{21}{8}\) : \(\dfrac{7}{8}\)
\(x\) = 3