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pls szybko muszę to zaraz odesłać pani zad.2 str.25 matematyka klasa 7​

Pls Szybko Muszę To Zaraz Odesłać Pani Zad2 Str25 Matematyka Klasa 7 class=

Odpowiedź :

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Odpowiedź:

a)  1/7 + 5/14= 2/14 + 5/14= 7/14= 1/2

b)  3/4 + 5/12= 9/12 + 5/12= 14/12= 1 i 2/12= 1 i 1/6

c)  8/9- 5/18= 16/18- 5/18= 11/18

d)  1/3 + 3/4= 4/12 + 9/12= 13/12= 1 i 1/12

e)   3/5 - 1/2= 6/10- 5/10= 1/10

f)  1 i 1/2 - 1/3= 1 i 3/6- 2/6= 1 i 1/6

g)  1 i 1/2 + 3/8= 1 i 4/8 +3/8= 1 7/8

h)     1 i 1/3 - 2/9= 1 i 3/9- 2/9= 1 i 1/9

i)   2 i 3/5 -7/10= 2 i 6/10-7/10=  1 i 16/10- 7/10= 1 i 9/10

j)   5/6 - 1/4= 10/12- 3/12= 7/12

k)  1 i 1/6 - 7/9= 1 i 3/18 - 14/18=  21/18- 14/18= 7/18

l)  2 i 3/8 - 1 i 5/6= 2 i 9/24- 1 i 20/24= 1 i 33/24- 1 i 20/24= 13/24

Szczegółowe wyjaśnienie:
a) 1/7 + 5/14 = 1/7/*2+ 5/14= 2/14 + 5/14 = 7/14/:7= 1/2

b) 3/4 + 5/12 = 3/4/*3 + 5/12 = 9/12 + 5/12 = 14/12 = 1 2/12 /:2= 1 1/6

c) 8/9 - 5/18 = 8/9 /*2 - 5/18 = 16/18 - 5/18 = 11/18

d) 1/3 + 3/4 = 1/3 /*4 + 3/4 /*3 = 4/12 + 9/12 = 13/12 = 1 1/12

e) 3/5 - 1/2 = 3/5 /*2 - 1/2 /*5 = 6/10 - 5/10 = 1/10

f) 1 1/2 - 1/3 = 3/2 - 1/3 = 3/2 /*3 - 1/3 /*2 = 9/6 - 2/6 = 7/6 = 1 1/6

g) 1 1/2 + 3/8 = 3/2 + 3/8 = 3/2 /*8 + 3/8 /*2 = 24/16 + 6/16 = 30/16 = 1 14/16 /:2= 1 7/8

h) 1 1/3 - 2/9 = 4/3 - 2/9 = 4/3 /*3 - 2/9 = 12/9 - 2/9 = 10/9 = 1 1/9

i) 2 3/5 - 7/10 = 13/5 - 7/10 = 13/5 /*2 - 7/10 = 26/10 - 7/10 = 19/10 = 1 9/10

j) 5/6 - 1/4 = 5/6 /*4 - 1/4 /*6 = 20/24 - 6/24 = 14/24 /:2 = 7/12

k) 1 1/6 - 7/9 = 7/6 - 7/9 = 7/6 /*9 - 7/9 /*6 = 63/54 - 42/54 = 21/54 /:3= 7/18

l) 2 3/8 - 1 5/6 = 19/8 - 11/6 = 19/8 /*6 - 11/6 /*8 = 114/48 - 88/48 = 26/48 /:2 = 13/24

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