694. Вычислите.

INSIGHT

Решение:

1) \( \frac{7}{10} - \frac{3}{10} = \frac{7-3}{10} = \frac{4}{10} = \frac{2}{5} \)

\( 18 \frac{7}{10} - 15 \frac{3}{10} = (18-15) + \frac{7-3}{10} = 3 + \frac{4}{10} = 3 \frac{2}{5} \)

\( 1 - \frac{18}{75} = \frac{75}{75} - \frac{18}{75} = \frac{75-18}{75} = \frac{57}{75} = \frac{19}{25} \)

\( 7 - 4 \frac{5}{8} = 7 - \frac{37}{8} = \frac{56}{8} - \frac{37}{8} = \frac{19}{8} = 2 \frac{3}{8} \)

\( 14 - 8 \frac{5}{19} = 14 - \frac{157}{19} = \frac{266}{19} - \frac{157}{19} = \frac{109}{19} = 5 \frac{14}{19} \)

\( 36 \frac{7}{18} - 18 \frac{13}{18} = (36-18) + \frac{7-13}{18} = 18 - \frac{6}{18} = 18 - \frac{1}{3} = 17 \frac{2}{3} \)

\( 100 - 17 \frac{24}{25} = 100 - \frac{449}{25} = \frac{2500}{25} - \frac{449}{25} = \frac{2051}{25} = 82 \frac{1}{25} \)

\( 87 \frac{3}{70} - 19 \frac{3}{70} = (87-19) + \frac{3-3}{70} = 68 + 0 = 68 \)

\( 27 - 15 \frac{3}{26} = 27 - \frac{403}{26} = \frac{702}{26} - \frac{403}{26} = \frac{299}{26} = 11 \frac{13}{26} = 11 \frac{1}{2} \)

\( 91 \frac{1}{75} - 56 \frac{2}{75} = (91-56) + \frac{1-2}{75} = 35 - \frac{1}{75} = 34 \frac{74}{75} \)

\( 63 \frac{3}{50} - 26 \frac{26}{50} = (63-26) + \frac{3-26}{50} = 37 - \frac{23}{50} = 36 \frac{27}{50} \)

2) \( 0,448 - 0,279 = 0,169 \)

\( 81,45 - 19,69 = 61,76 \)

\( 1345,7 - 976,8 = 368,9 \)

\( 4796,81 - 848,56 = 3948,25 \)

\( 1 - 0,79 = 0,21 \)

\( 100 - 14,845 = 85,155 \)

INSIGHT