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x . 1,2 - 3,45 = 4,68
x . 1,2 = 4,68 + 3,45 = 8,13
x = 8,13 : 1,2 = 3,775
x . 1,2 - 3,45 = 4,68
x . 1,2 = 4,68 + 3,45
x . 1,2 = 8,13
x = 8,13 : 1,2
x = 6,775
3,45x0,99+3,45:100=\(3,45\times\frac{99}{100}+3,45\times\frac{1}{100}\)
=\(3,45\times\left(\frac{99}{100}+\frac{1}{100}\right)\)
=\(3,45\times1\)
=3,45
ok chưa bạn?
3,45x0,9+3,45:100= \(3,45\times\frac{9}{10}+3,45\times\frac{1}{100}\)
=\(3,45\times\left(\frac{90}{100}+\frac{1}{100}\right)\)
=\(3,45\times\frac{91}{100}\)
=3,1395
chúc bạn học tốt +-*/
a) 17,8 + 6,75 + 12,2
= 17,8 + 12,2 + 6,75
= 30 + 6,75
= 36,75
b)
1,5 + 2,5 + 3,5 + 4,5 + 5,5 + 6,5 + 7,5 + 8,5
= ( 1,5 + 8,5 ) + ( 2,5 + 7,5 ) + ( 3,5 + 6,5 ) + ( 4,5 + 5,5 )
= 10 + 10 + 10 + 10
= 20 + 10 + 10
= 30 + 10
= 40
A, \(\dfrac{7}{9}\) = \(\dfrac{7\cdot5}{9\cdot5}\) = \(\dfrac{35}{45}\) \(\dfrac{3}{5}\) = \(\dfrac{3\cdot9}{5\cdot9}\) = \(\dfrac{27}{45}\)
Vậy \(\dfrac{7}{9}\) > \(\dfrac{3}{5}\)
B, \(\dfrac{3}{4}\) = \(\dfrac{3\cdot6}{4\cdot6}\) = \(\dfrac{18}{24}\) \(\dfrac{5}{6}\) = \(\dfrac{5\cdot4}{6\cdot4}\) = \(\dfrac{20}{24}\)
Vậy \(\dfrac{3}{4}\) < \(\dfrac{5}{6}\)
C, \(\dfrac{1}{4}\) = \(\dfrac{1\cdot3}{4\cdot3}\) = \(\dfrac{3}{12}\) \(\dfrac{2}{3}\) = \(\dfrac{2\cdot4}{3\cdot4}\) = \(\dfrac{8}{12}\)
Vậy \(\dfrac{1}{4}\) < \(\dfrac{2}{3}\)
D, \(\dfrac{8}{9}\) = \(\dfrac{8\cdot2}{9\cdot2}\) = \(\dfrac{16}{18}\) \(\dfrac{1}{2}\) = \(\dfrac{1\cdot9}{2\cdot9}\) = \(\dfrac{9}{18}\)
Vậy \(\dfrac{8}{9}\) > \(\dfrac{1}{2}\)
\(\cdot\) là dấu nhân
a)3,45+6,75:2
=3,45+3,375
=6,825
b)4,5-3,2:2
=4,5-1,6
=2,9
c)6,77.2-10+1,2
=13,54-10+1,2
=3,54+1,2
=2,34
d)14,7:2-3,45-0,68
=7,35-3,45-0,68
=3,9-0,68
=3,22
`a)3,45+6,75:2=3,45+3,375=6,825`
`b)4,5-3,2:2=4,5-1,6=2,9`
`c)6,77.2-10+1,2=13,54-10+1,2=3,45+1,2=4,74`
`d)14,7:2-3,45-0,68=7,35-3,45-0,68=3,9-0,68=3,22`