Ответ:

а) 3/2+(2 1/4- 1 1/2)= \frac{3}{2} +( \frac{9}{4} - \frac{3}{2}) = \frac{3}{2} +( \frac{9}{4} - \frac{6}{4}) = \frac{6}{4} + \frac{3}{4} = \frac{9}{4} = 2 \frac{1}{4}

2

3

+(

4

9

−

2

3

)=

2

3

+(

4

9

−

4

6

)=

4

6

+

4

3

=

4

9

=2

4

1

б) 2,6- 1 2/7 = \frac{26}{10} - \frac{9}{7}

10

26

−

7

9

=\frac{182}{70} - \frac{90}{70} = \frac{92}{70} = \frac{46}{35} = 1 \frac{11}{35}

70

182

−

70

90

=

70

92

=

35

46

=1

35

11

1. а) 2  1/4

б)   1   11/35

2. 10 23/30

3. 4   1/2