Question

3/20+7/30+2/40=???
3/20+7/30+9/50=???
7/40+11/70+13/30=???

Answer 1

Ответ:

Пошаговое объяснение:

$frac{3}{20} +frac{7}{30} +frac{2}{40}=frac{13}{30}$

$frac{3}{20} +frac{7}{30} =frac{9}{60} +frac{14}{60} =frac{23}{60}$

$frac{23}{60} +frac{2}{40} =frac{46}{120} +frac{6}{120} =frac{52}{120} =frac{13}{30}$

$frac{3}{20} +frac{7}{30} +frac{9}{50}=frac{169}{300}$

$frac{3}{20} +frac{7}{30} =frac{9}{60} +frac{14}{60} =frac{23}{60}$

$frac{23}{60} +frac{9}{50} =frac{115}{300} +frac{54}{300} =frac{169}{300}$

$frac{7}{40} +frac{11}{70} +frac{13}{30}=frac{643}{840}$

$frac{7}{40} +frac{11}{70} =frac{49}{280} +frac{44}{280} =frac{93}{280}$

$frac{93}{280} +frac{13}{30} =frac{279}{840} +frac{364}{840} =frac{643}{840}$