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Wolfram998877
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Dau coroana!!

8 3/7- 2 2/5
3 11/15- 1 7/10

Răspuns :

8  3/7 - 2  2/5 =

= (8x3 + 3)/7 - (2x5 + 2)/5

= 27/7 - 12/5

= (135 - 84)/35

= 51/35

3  11/15 - 1  7/10 =

= (3x15 + 11)/15 - (1x10 + 7)/10

= 56/15 - 17/10

= (112 - 51)/30

= 61/30

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