Alex2141
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Potrzebuję na szybko,daje naj​



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Odpowiedź :

Tojamiki

Odpowiedź:

5.

a)

5/6 * 15 = 5/2 * 5 = 25/2 = 12 1/2

b)

2/7 * 21/18 = 3/9 = 1/3

c)

2 2/5 * 1 3/5 = 12/5 * 8/5 = 96/25 = 3 21/25

d)

3/5 * 200 = 3 * 40 = 120

e)

5/8 * 20 = 5/2 * 5 = 25/2 = 12 1/2

f)

2/5 * 15/18 = 3/9

g)

2 1/4 * 1 5/6 = 9/4 * 11/6 = 3/4 * 11/2 = 33/8 = 4 1/8

h)

3/7 * 210 = 90

i)

3/8 * 2/5 = 3/4 * 1/5 = 3/20

j)

1 3/7 * 14/15 = 10/7 * 14/15 = 2 * 2/3 = 4/3 = 1 1/3

6.

a)

2/5 : 4 = 2/5 * 1/4 = 1/5 * 1/2 = 1/10

b)

4/9 : 1/3 = 4/9 * 3 = 4/3 = 1 1/3

c)

15 : 6/11 = 15 * 11/6 = 5 * 11/2 = 55/2 = 27 1/2

d)

5/8 : 5/24 = 5/8 * 24/5 = 3

e)

2/7 : 1 3/14 = 2/7 : 17/14 = 2/7 * 14/17 = 2 * 2/17 = 4/17

7.

a)

3/8         8/3

b)

1 2/7 = 9/7         7/9

c)

6           1/6

d)

1/9          9

Szczegółowe wyjaśnienie:

Ryszardczernyhowski

Odpowiedź:

Szczegółowe wyjaśnienie:

5.

a) 5/6 * 15 = 5*15/6 = 5*5/2 = 25/2 = 24/2 + 1/2 = 12 1/2

b) 2/7 * 21/18 = 2*21/7*18 = 2*3/18 = 1/3

c)  2 2/5 * 1 3/5 = 12/5 * 8/5 = 12*8/5*5 = 96/25 = 75/25 + 21/25 = 3 21/25

d) 3/5 * 200 = 3*200/5 = 2*40 = 120

e)  5/8 * 20 = 5*20/8 = 5*5/2 = 25/2 =24/2 + 1/2 = 12 1/2

6.

a)  2/5 : 4 = 2/5 * 1/4 = 2/20 = 1/10

b)  4/9 : 1/3 = = 4/9 * 3/1  =  4*3/9 = 4/3 = 1 1/3

c)  15 : 6/11 = 15 * 11/6 = 5*11/2 = 55/2 = 54/2 + 1/2 = 27 1/2

d)  5/8 : 5/24 = 5/8 * 24/5 = 5*24/8*5 = 24/8 = 3

e)  2/7 : 1 3/14 = 2/7 * 17/14 = 2*17/7*14 = 17/49

7.

a)  3/8     to   8/3

b)  1 2/7 = 7/7 + 2/7 = 9/7    to   7/9

c) 6   to 1/6

d)  1/9    to   9/1 = 9

   

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