Question

Efectuati:

a) 3/2 + 7/8
b) 5/3 + 4/9
c) 13/2 + 4/15
d) 5/4 + 13/12
e) 8/15 + 4/5
f) 11/9 + 5/18

Ajutor va rog / inseamna supra!

Answer 1

Răspuns:

Explicație pas cu pas:

a)   3/2 + 7/8 = (3×4)/(2×4)+7/8 = 12/8 + 7/8 = 19/8 = 2 intregi si 3/8

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b)  5/3 + 4/9 = (5×3)/(3×3) + 4/9 = 15/9 + 4/9 = 19/9 = 2 intregi si 1/9

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c)  13/2 + 4/15 =

= (13×15)/(2×15) + (4×2)/(15×2) =

= 195/30 + 8/30 =

= 203/30 =

= 6 intregi si 23/30

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d)

5/4 + 13/12 =

= (5×3)/12 + 13/12 =

= (15 + 13) /12 =

= 28/12 =

= (28:4)/(12:4)=

=7/3 =

= 2 intregi si 1/3

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e)

8/15 + 4/5 =

= 8/15 + (4×3)/(5×3)=

= 8/15 + 12/15 =

= (8+12)/15 =

= 20/15 =

= 4/3

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f)  

11/9 + 5/18 = 3/2

= (11×2)/(9×2) + 5/18 =

= (22 + 5)/18 =

= 27/18 =

= (27:9)/(18:9) =

= 3/2 =

= 1 intreg si 1/2