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a,
\(\begin{array}{l}x - 5,01 = 7,02 - 2.1,5\\x - 5,01 = 7,02 - 3\\x - 5,01 = 4,02\\x = 4,02 + 5,01\\x = 9,03\end{array}\)
Vậy \(x=9,03\)
b,
\(\begin{array}{l}x:2,5 = 1,02 + 3.1,5\\x:2,5 = 1,02 + 4,5\\x:2,5 = 5,52\\x = 5,52.2,5\\x = 13,8\end{array}\)
Vậy \(x=13,8\).
1) x - 5,01 = 7,02 - 2.1,5
x - 5,01 = 4,02
x = 4,02 + 5,01
x = 9,03
\(x:2,5=1,02+3\times1,5\\ \Rightarrow x:2,5=1,02+4,5\\ \Rightarrow x:2,5=5,52\\ \Rightarrow x=5,52\times2,5\\ \Rightarrow x=13,8\)
Bài 1:
a) \(\dfrac{9}{20}-\dfrac{8}{15}\times\dfrac{5}{12}\)
\(=\dfrac{9}{20}-\dfrac{2}{9}\)
\(=\dfrac{41}{180}\)
b) \(\dfrac{2}{3}\div\dfrac{4}{5}\div\dfrac{7}{12}\)
\(=\dfrac{2}{3}\times\dfrac{5}{4}\times\dfrac{12}{7}\)
\(=\dfrac{5}{6}\times\dfrac{12}{7}\)
\(=\dfrac{10}{7}\)
c) \(\dfrac{7}{9}\times\dfrac{1}{3}+\dfrac{7}{9}\times\dfrac{2}{3}\)
\(=\dfrac{7}{9}\times\left(\dfrac{1}{3}+\dfrac{2}{3}\right)\)
\(=\dfrac{7}{9}\times1\)
\(=\dfrac{7}{9}\)
Bài 2:
a) \(2\times\left(x-1\right)=4026\)
\(\left(x-1\right)=4026\div2\)
\(x-1=2013\)
\(x=2014\)
Vậy: \(x=2014\)
b) \(x\times3,7+6,3\times x=320\)
\(x\times\left(3,7+6,3\right)=320\)
\(x\times10=320\)
\(x=320\div10\)
\(x=32\)
Vậy: \(x=32\)
c) \(0,25\times3< 3< 1,02\)
\(\Leftrightarrow0,75< 3< 1,02\) ( S )
=> \(0,75< 1,02< 3\)
1) x - 5,01 = 7,02 - 2.1,5
x - 5,01 = 4,02
x = 4,02 + 5,01
x = 9,03
2) x : 2,5 = 1,02 + 3.1,5
x : 2,5 = 5,52
x = 5,52 x 2,5
x = 13,8