1) 13-6/17 2) 6 1/7-2 6/7 И решите уравнения а) 45 13/19-x=31 15/19 б) 3 17/23+x = 4...

1) $13- \frac{6}{17}= \frac{221}{17}- \frac{6}{17}= \frac{215}{17}=12 \frac{11}{17}$
2) $6 \frac{1}{7}-2 \frac{6}{7}= \frac{43}{7} - \frac{20}{7}= \frac{23}{7}=3 \frac{2}{7}$
Уравнения:
) $45 \frac{13}{19}-x=31 \frac{15}{19} x=45 \frac{13}{19}-31 \frac{15}{19}= \frac{868}{19}- \frac{604}{19}= \frac{264}{19}=13 \frac{17}{19}$
$x=13 \frac{17}{19}$
б) $3 \frac{17}{23} +x=4 \frac{21}{23} x=4 \frac{21}{23}-3 \frac{17}{23}= \frac{113}{23}- \frac{86}{23}= \frac{27}{23}=1 \frac{4}{23}$
$x=1 \frac{4}{23}$