Выполните действие и сократите результат: 1) 5/18+4/18 2) 25/34-8/34 3) 3 13/45 + 6 17/45 4) 12 43/56-7 22/56

$\frac{5}{18} + \frac{4}{18} = \frac{5 + 4}{18} = \frac{9}{18} = \frac{1}{2}$

$\frac{25}{34} - \frac{8}{34} = \frac{25 - 8}{34} = \frac{17}{34} = \frac{1}{2}$

$3 \frac{13}{45} + 6 \frac{17}{45} = \frac{3 \times 45 + 13}{45} + \frac{6 \times 45 + 17}{45} = \frac{135 + 13}{45} + \frac{270 + 17}{45} = \frac{148}{45} + \frac{287}{45} = \frac{148 + 287}{45} = \frac{435}{45} = 9 \frac{30}{45} = 9 \frac{2}{3}$

$12 \frac{43}{56} - 7 \frac{22}{56} = \frac{12 \times 56 + 43}{56} - \frac{7 \times 56 + 22}{56} = \frac{672 + 43}{56} - \frac{392 + 22}{56} = \frac{715}{56} - \frac{414}{56} = \frac{715 - 414}{56} = \frac{301}{56} = 5 \frac{21}{56} = 5 \frac{3}{8}$