693. Найдите сумму.

INSIGHT

Решение:

1) \( \frac{1}{4} + \frac{3}{4} = \frac{1+3}{4} = \frac{4}{4} = 1 \)

\( \frac{5}{9} + \frac{5}{9} = \frac{5+5}{9} = \frac{10}{9} = 1 \frac{1}{9} \)

\( 8 \frac{1}{6} + 2 \frac{5}{16} = \frac{49}{6} + \frac{37}{16} = \frac{49 \cdot 8}{48} + \frac{37 \cdot 3}{48} = \frac{392+111}{48} = \frac{503}{48} = 10 \frac{23}{48} \)

\( 18 \frac{2}{9} + 25 \frac{5}{9} + 38 \frac{2}{9} = (18+25+38) + \frac{2+5+2}{9} = 81 + \frac{9}{9} = 81+1 = 82 \)

\( 16 \frac{2}{25} + 44 \frac{7}{25} + 19 \frac{6}{25} = (16+44+19) + \frac{2+7+6}{25} = 79 + \frac{15}{25} = 79 + \frac{3}{5} = 79 \frac{3}{5} \)

\( \frac{15}{20} + \frac{7}{20} + \frac{8}{20} = \frac{15+7+8}{20} = \frac{30}{20} = \frac{3}{2} = 1 \frac{1}{2} \)

2) \( 0,75 + 0,37 = 1,12 \)

\( 201,9 + 19,6 = 221,5 \)

\( 0,735 + 1,348 = 2,083 \)

\( 82,376 + 0,048 = 82,424 \)

\( 348,49 + 18,07 + 564,59 = 931,15 \)

\( 251,28 + 15,03 + 100,01 = 366,32 \)

\( 13,396 + 1,894 = 15,29 \)

\( 96,48 + 48,76 = 145,24 \)

INSIGHT