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2/15-3/10, -1/4+2/5, -3/7-20/21, 5/6-3/8
Va rog dau coroana aici 100pcte


Răspuns :

²⁾2/15 - ³⁾3/10 =

= (4 - 9)/30

= - 5⁽⁵/30

= - 1/6

⁵⁾- 1/4 + ⁴⁾2/5 =

= (- 5 + 8)/20

= 3/20

³⁾- 3/7 - 20/21 =

= ( - 9 - 20)/21

= - 29/21

⁴⁾5/6 - ³⁾3/8 =

= (20 - 9)/24

= 11/24

Explicație pas cu pas:

2/15-3/10 =

4/30 - 9/30 =

-5/30 =

-1/6

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-1/4+2/5 =

-5/20 + 8/20 =

3/20

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-3/7-20/21 =

-9/21 - 20/21 =

-29/21 =

-1 8/21

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5/6-3/8 =

20/24 - 9/24 =

11/24.