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a) 2,5 dm3 = 2500 cm3
1,03 dm3 = 1030 cm3
b) 3050 cm3 = 3,05 dm3
135000 cm3 = 135 dm3
a) 2,5 dm3 = 2500 cm3
1,03dm3 = 1030 cm3
b) 3050 cm3 = 3,050 dm3
135 000 cm3 = 135 dm3
D= 3/1 x (1/3-1/4 +1/4 -1/5+......+1/29 -1/30)
D=3 x (1/3 -1/30 )
D=3 x 3/10
D=9/10
Trời Ơi! Nhầm rùi!
Phải là 1/31 chứ
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(1+1/105)x(1+1/106)x(1+1/107)x(1+1/108)+(1+1/109)
=109/105+110/109
=23431/11445
\(\left(1-\frac{1}{2018}\right)\times\left(1-\frac{1}{2019}\right)\times\left(1-\frac{1}{2020}\right)\times\left(1-\frac{1}{2021}\right)\times\left(1-\frac{1}{2022}\right)\)
\(=\frac{2017}{2018}\times\frac{2018}{2019}\times\frac{2019}{2020}\times\frac{2020}{2021}\times\frac{2021}{2022}\)
\(=\frac{2017}{2022}\)
x +\(\frac{1}{6}\)=\(\frac{1}{3}\)-\(\frac{1}{4}\)
x +\(\frac{1}{6}\)=\(\frac{1}{12}\)
x =\(\frac{1}{12}\)-\(\frac{1}{6}\)
x =\(-\frac{1}{12}\)
x -\(\frac{5}{12}\)=\(\frac{1}{3}+\frac{1}{4}\)
x -\(\frac{5}{12}\)=\(\frac{7}{12}\)
x =\(\frac{7}{12}\)+\(\frac{5}{12}\)
x = 1
x +\(\frac{1}{2}\)=\(\frac{4}{5}\)
x =\(\frac{4}{5}\)-\(\frac{1}{2}\)
x =\(\frac{3}{10}\)
x -\(\frac{1}{6}\)=\(\frac{1}{2}\)+\(\frac{1}{3}\)
x -\(\frac{1}{6}\)=\(\frac{5}{6}\)
x =\(\frac{5}{6}\)+\(\frac{1}{6}\)
x = 1
x +\(\frac{1}{8}\)=\(\frac{1}{2}\)-\(\frac{1}{3}\)
x +\(\frac{1}{8}\)=\(\frac{1}{6}\)
x =\(\frac{1}{6}\)-\(\frac{1}{8}\)
x =\(\frac{1}{24}\)
Học tốt!!!
the only
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\(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\left(1-\frac{1}{4}\right)\times...\times\left(1-\frac{1}{10}\right)\)
\(=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{9}{10}\)
\(=\frac{1}{10}\)
\(\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right)...\left(1-\frac{1}{10}\right)\)
\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.....\frac{9}{10}\)
\(=\frac{1.2.3....9}{2.3.4...10}=\frac{1}{10}\)
Ủng hộ mk nha !!! ^_^
( 1/25 - 1/30 ) x 150 + 1,03 : 1,03 x ( x - 1 ) = 3 ( 1/150 x 150 + 1 x ( x - 1 ) = 3 1 + ( x - 1 ) = 3 x - 1 = 3 - 1 = 2 x = 1 + 2 x = 3