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(140 x \(\frac{7}{3}\) - 138 x \(\frac{5}{12}\)) : \(\frac{49}{6}\)=
=\(:\frac{49}{6}\)
= (\(\frac{1960}{6}-\frac{345}{6}\) ) :\(\frac{49}{6}\)
=\(\frac{1615}{6}:\frac{49}{6}\)
=\(\frac{1615}{49}\)
\(\frac{2}{3}+\frac{1}{3}.\left(-\frac{4}{5}+\frac{5}{6}\right):\frac{7}{12}=\frac{24}{35}\)
Xin lỗi mk ko giải dài đước
đúng đó
= 2/3 + 1/3.1/30 : 7/12
= 2/3 + 1/90 : 7/12
= 2/3 + 2/105
= 24/35
Tk mk nha
a,\(\frac{5}{6}:\frac{-7}{12}\) b, \(\frac{-21}{24}:\frac{-14}{8}\)
d,\(\frac{4}{5}:\frac{-8}{15}\)e,\(\frac{3}{5}+\frac{-7}{4}\)
g,\(\frac{5}{12}-\frac{-7}{12}\)h,\(\frac{-15}{16}.\frac{8}{-25}\)
\(=\dfrac{2}{3}+\dfrac{1}{3}.\dfrac{7}{18}.\dfrac{12}{7}\)
\(=\dfrac{2}{3}+\dfrac{7.3.2.2}{3.7.3.2.3}\)
\(=\dfrac{2}{3}+\dfrac{2}{9}=\dfrac{8}{9}\)
TICK CHO MÌNH NHÉ
Giải:
\(\dfrac{2}{3}\) + \(\dfrac{1}{3}\) . (\(-\dfrac{4}{9}\) + \(\dfrac{5}{6}\) ) : \(\dfrac{7}{12}\)
= \(\dfrac{2}{3}\) + \(^{\dfrac{1}{3}}\) . \(\dfrac{7}{18}\) : \(\dfrac{7}{12}\)
= \(\dfrac{2}{3}\) + \(\dfrac{7}{54}\) : \(\dfrac{7}{12}\)
= \(\dfrac{2}{3}\) + \(\dfrac{2}{9}\)
= \(\dfrac{8}{9}\)
\(=\dfrac{2}{3}+\dfrac{1}{3}.\left(\dfrac{7}{18}\right):\dfrac{7}{12}\)
\(=\dfrac{2}{3}+\dfrac{7}{54}:\dfrac{7}{12}\)
\(=\dfrac{2}{3}+\dfrac{2}{9}\)
\(=\dfrac{8}{9}\)
( − 12 ) . 7 − 6 . ( − 5 ) = ( − 84 ) − ( − 30 ) = ( − 84 ) + 30 = − 54.