Question

плиз хелп ме!!!!!!!!!​

Answer 1

Ответ:

2 1/2 * 2 4/5 = 5/2 * 14/5 = 7

2 2/9 * 2 19/40 = 20/9 * 99/40 = 11/2 = 5.5

1 1/5 * 2 11/12 = 6/5 * 35/12 = 5/2 = 2.5

Answer 2

Ответ:

1) 7

2)5 1/2

3)3 1/2

Пошаговое объяснение:

1)2

1

2

×2

4

5

=

2 · 2 + 1

2

×

2 · 5 + 4

5

=

5

2

×

14

5

=

5 · 14

2 · 5

=

70

10

=7

2)2

2

9

×2

19

40

=

2 · 9 + 2

9

×

2 · 40 + 19

40

=

20

9

×

99

40

=

20 · 99

9 · 40

=

1980

360

=

11 · 180

2 · 180

=

11

2

=5

1

2

= 5.5

3)1

1

5

×2

11

12

=

1 · 5 + 1

5

×

2 · 12 + 11

12

=

6

5

×

35

12

=

6 · 35

5 · 12

=

210

60

=

7 · 30

2 · 30

=

7

2

=3

1

2

= 3.5