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Bài 1:
a; \(\dfrac{7}{8}\) + \(x\) = \(\dfrac{4}{7}\)
\(x\) = \(\dfrac{4}{7}\) - \(\dfrac{7}{8}\)
\(x\) = \(\dfrac{32}{56}\) - \(\dfrac{49}{56}\)
\(x=-\) \(\dfrac{49}{56}\)
Vậy \(x=-\dfrac{49}{56}\)
b; 6 - \(x\) = - \(\dfrac{3}{4}\)
\(x\) = 6 + \(\dfrac{3}{4}\)
\(x\) = \(\dfrac{24}{4}+\dfrac{3}{4}\)
\(x=\dfrac{27}{4}\)
Vậy \(x=\dfrac{27}{4}\)
c; \(\dfrac{1}{-5}\) + \(x\) = \(\dfrac{3}{4}\)
\(x\) = \(\dfrac{3}{4}\) + \(\dfrac{1}{5}\)
\(x=\dfrac{15}{20}\) + \(\dfrac{4}{20}\)
\(x=\dfrac{19}{20}\)
Vậy \(x=\dfrac{19}{20}\)
Bài 1:
d; - 6 - \(x\) = - \(\dfrac{3}{5}\)
\(x\) = - 6 + \(\dfrac{3}{5}\)
\(x=-\dfrac{30}{5}\) + \(\dfrac{3}{5}\)
\(x=-\dfrac{27}{5}\)
Vậy \(x=-\dfrac{27}{5}\)
e; - \(\dfrac{2}{6}\) + \(x\) = \(\dfrac{5}{7}\)
\(x\) = \(\dfrac{5}{7}\) + \(\dfrac{2}{6}\)
\(x\) = \(\dfrac{15}{21}\) + \(\dfrac{1}{3}\)
\(x=\dfrac{15}{21}\) + \(\dfrac{7}{21}\)
\(x=\dfrac{22}{21}\)
Vậy \(x=\dfrac{22}{21}\)
f; - 8 - \(x\) = - \(\dfrac{5}{3}\)
\(x\) = \(-\dfrac{5}{3}\) + 8
\(x\) = \(\dfrac{-5}{3}\) + \(\dfrac{24}{3}\)
\(x\) = \(\dfrac{-19}{3}\)
Vậy \(x=-\dfrac{19}{3}\)
Bài 5, 7. Mở điện thoại cài phần mềm PhotoMath nó chỉ lời giải và đáp án cho. Nếu thắc mắc thì seach mạng nha.
a)\(...-\dfrac{22}{7}.\dfrac{6}{55}.\left(-\dfrac{7}{12}\right)=\dfrac{22}{7}.\dfrac{6}{55}.\dfrac{7}{12}=\dfrac{1}{5}\)
b) \(\dfrac{18}{39}.\left(-\dfrac{13}{8}\right):\left(-\dfrac{27}{4}\right)=-\dfrac{3}{4}.\left(-\dfrac{4}{27}\right)=\dfrac{1}{9}\)
`a)-3 1/7. 6/55.(-7/12)`
`= -22/7 . 6/55 . (-7/12) `
`= -12/35 . (-7/12 ) `
`= 1/5 `
`b)18/39.( -1 5/8) : (-6 3/4)`
`= 18/39 . (-13)/8 : (-27)/4 `
`= 18/39 . (-13)/8 . (-4)/27 `
`= (-3)/4 . (-4)/27`
`= 1/9`