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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) \(\frac{7}{8}-\frac{5}{12}=\frac{84}{96}-\frac{40}{96}=\frac{44}{96}=\frac{11}{24}\)
B)\(\frac{8}{15}-\frac{2}{5}=\frac{8}{15}-\frac{6}{15}=\frac{2}{15}\)
C)\(\frac{5}{6}-\frac{3}{10}=\frac{50}{60}-\frac{18}{60}=\frac{32}{60}=\frac{8}{15}\)
D)\(\frac{7}{10}-\frac{1}{5}=\frac{7}{10}-\frac{2}{10}=\frac{5}{10}=\frac{1}{2}\)
2)A)\(\frac{5}{10}-\frac{2}{15}=\frac{1}{2}-\frac{2}{15}=\frac{15}{30}-\frac{4}{30}=\frac{11}{30}\)
B)\(\frac{5}{20}-\frac{1}{6}=\frac{1}{4}-\frac{1}{6}=\frac{6}{24}-\frac{4}{24}=\frac{2}{24}=\frac{1}{12}\)
C)\(\frac{6}{18}-\frac{6}{24}=\frac{1}{3}-\frac{1}{4}=\frac{4}{12}-\frac{3}{12}=\frac{1}{12}\)
D)\(\frac{5}{9}-\frac{3}{12}=\frac{5}{9}-\frac{1}{4}=\frac{20}{36}-\frac{9}{36}=\frac{11}{36}\)
Chúc bạn học tốt
A) \(\frac{4}{5}+\frac{5}{4}-2=\frac{16}{20}+\frac{25}{20}-\frac{40}{20}\)
\(=\frac{1}{20}\)
B) \(3-\frac{2}{3}-\frac{3}{2}=\frac{18}{6}-\frac{4}{6}-\frac{9}{6}\)
\(=\frac{5}{6}\)
C) \(\frac{7}{8}-\left(\frac{1}{4}+\frac{2}{5}\right)=\frac{7}{8}-\frac{13}{20}\)
\(=\frac{35}{40}-\frac{26}{40}=\frac{9}{40}\)
D) \(\frac{9}{10}-\left(\frac{2}{5}+\frac{3}{10}\right)+\frac{7}{10}=\frac{9}{10}-\frac{7}{10}+\frac{7}{10}\)
\(=\frac{9}{10}\)
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`