а)

4 + 5 \frac{1}{4}

;
б)

4 \frac{3}{4} - 2

;
в)

1 \frac{2}{9} + 3

;
г)

4 \frac{1}{3} - 1 \frac{1}{2}

а) 4 + 5 1 4 ; б) 4 3 4 − 2 ; в) 1 2 9 + 3 ; г) 4 1 3 − 1 1 2 .

4 + 5 \frac{1}{4} = 4 + 5 + \frac{1}{4} = 9 + \frac{1}{4} = 9 \frac{1}{4}

4 \frac{3}{4} - 2 = 4 - 2 + \frac{3}{4} = 2 + \frac{3}{4} = 2 \frac{3}{4}

1 \frac{2}{9} + 3 = 1 + 3 + \frac{2}{9} = 4 \frac{2}{9}

4 \frac{1}{3} - 1 \frac{1}{2} = 4 \frac{1}{3} - 1 - \frac{1}{2} = 3 \frac{1}{3} - \frac{1}{2} = 2 \frac{4}{3} - \frac{1}{2} = 2 + \frac{4 * 2 - 1 * 3}{6} = 2 + \frac{8 - 3}{6} = 2 \frac{5}{6}