1). 4 3/4 + 2 4/6 = .... 2). 6 4/8 - 2 1/6 =... 3). 3,2 : 0,8 + 0,75 =...

1)4 3/4 + 2 4/6 = 19/4 + 16/6
=57/12 + 32/12
=89/12
2)6 4/8 - 2 1/6 =52/8 - 13/6
=156/24 - 52/24
=104/24
3)3,2:0,3+0,75=11,4

[tex] 1. \: \: 4\frac{3}{4} + 2 \frac{4}{6} \\ = \frac{19}{4} + \frac{16}{6} \\ = \frac{(19 \times 3) + (16 \times 2)}{12} \\ = \frac{57 + 32}{12} \\ = \frac{89}{12} \\ = 7 \ \frac{5}{12} [/tex]
[tex]2. \: 6 \frac{4}{8} - 2 \frac{1}{6} \\ = \frac{52}{8} - \frac{13}{6} \\ = \frac{(52 \times 3) - (13 \times 4)}{24} \\ = \frac{156 - 52}{24} \\ = \frac{104}{24} \\ = 4 \frac{8}{24} \\ = 4 \frac{1}{3} [/tex]
[tex](3.2 \div 0.8) + 0.75 \\ = 4 + 0.75 \\ = 4.75[/tex]