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245:x+7150=7199
245:x=7199-7150
245:x=49
x=245:49
x=5
k cho mk nhé thanks
98775 - 32 x 85
=98775 -2720
=96055
67500 - 24 x 236
= 67500 -5664
=61836
568 + 101598 : 287
= 568 +354
=922
6875 + 980 -180
=7855 -180
=7675
\(\dfrac{2}{5}+\dfrac{3}{10}-\dfrac{1}{2}\)
\(=\dfrac{7}{10}-\dfrac{1}{2}\)
= \(\dfrac{1}{5}\)
\(\dfrac{8}{11}+\dfrac{8}{33}x\dfrac{3}{4}\)
\(=\dfrac{8}{11}+\dfrac{2}{11}\)
\(=\dfrac{10}{11}\)
\(\dfrac{7}{9}x\dfrac{3}{14}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}x\dfrac{8}{5}\)
\(=\dfrac{8}{30}\)
\(=\dfrac{4}{15}\)
\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}\)
\(=\dfrac{5}{12}-\dfrac{7}{32}x\dfrac{16}{21}\)
\(=\dfrac{5}{12}-\dfrac{1}{6}\)
\(=\dfrac{5}{12}-\dfrac{2}{12}\)
\(=\dfrac{3}{12}=\dfrac{1}{4}\)
\(11\) \(\div\) \(92\) \(=\) \(\frac{11}{92}\)
\(76\) \(\div\) \(980\) \(=\) \(\frac{76}{980}\) \(=\) \(\frac{19}{245}\)
\(9\) \(\div\) \(7558\) \(=\) \(\frac{9}{7558}\)
\(85\) \(\div\) \(980\) \(=\) \(\frac{85}{980}\) \(=\) \(\frac{17}{196}\)
\(86\) \(\div\) \(879\) \(=\) \(\frac{86}{879}\)
980 : 2 x 30789 = 490 x 30789
= 15 086 610
980 : 2 x 30789
= 490 x 30789
= 15086610
k mk nha