Tolong bantu dong kk/ bg

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Tolong bantu dong kk/ bg​

 

1) \frac{12}{45} + 5\frac{7}{30}

\frac{12(:3)}{45(:3)} + 5 \frac{7}{30} =

\frac{4}{15} + \frac{157}{30} =

\frac{120}{450} + \frac{2.355}{450} =

\frac{2.475(:225)}{450(:225)}= \frac{11}{2}

\frac{11}{2} = 5\frac{1}{2}

——————–

2) 5\frac{9}{32} + \frac{13}{24}

\frac{169}{32} + \frac{13}{24} =

\frac{4.056}{768} + \frac{416}{768} = \frac{4.472}{768}

\frac{4.472(:8)}{768(:8)} = \frac{559}{96}

\frac{559}{96} = 5\frac{79}{96}

——————–

3) 4\frac{3}{8} – \frac{1}{8}

\frac{35}{8} – \frac{1}{8} = \frac{34}{8}

\frac{34(:2)}{8(:2)} = \frac{17}{4}

\frac{17}{4} = 4\frac{1}{4}

——————–

4) 3\frac{6}{15} – \frac{9}{20}

\frac{51}{15} – \frac{9}{20} =

\frac{51(:3)}{15(:3)} = \frac{17}{5} – \frac{9}{20} =

\frac{340}{100} – \frac{45}{100} = \frac{295}{100}

\frac{295(:5)}{100(:5)} = \frac{59}{20}

\frac{59}{20} = 2\frac{19}{20}


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