Ajutor! Urgent

Ex 5 , Dau coroană

(sper că se vede în imagine)

Răspuns:

a)-9/9+(-5/9)=-14/9∈Q

b)49/14+(-10/14)=39/14

c) -21/5+(+61/15)=-63/15+(+61/15)=-2/15 ∈ Q

d) 10/36+(-21/36)+(-4/36)=-15/36=-5/12 ∈ Q

e) -12/60+(-18/60)+(-28/60)+(+57/60)=-1/60 ∈Q

f)-19/12+[-5/8+(-7/24)]=-38/24+(-15/24-7/24)=-38/24+(-22/24)=-60/24=-5/2 ∈Q

g) -8/5+3/10+(-12/10)+93/90=-144/90+27/90-108/90+93/90=-132/90=-44/30=-22/15 ∈Q

h) 38/9+(-37/9)+(-23/6)+100/27=1/9+(-23/6)+100/27=6/54-207/54+200/54=6/54-7/57=-1/54 ∈Q

Explicație pas cu pas:

Răspuns:

Explicație pas cu pas:

Introduci intregii in fractie, aduci la acelasi numitor si faci calculele. La sfarsit simplifici fractia obtinuta ca rezultat.

-1 - 5/9 = -9/9 - 5/9 = -14/9

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7/2 - 5/7 = 49/14 - 10/14 = 39/14

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-21/5 + 61/15 = -63/15 + 61/15 = -2/15

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5/18 - 7/12 -1/9 = 10/36 - 21/36 -4/36 = -15/36 = -5/12

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-1/5 - 3/10 - 7/15 + 19/20 = -12/60 - 18/60 - 28/60 + 57/60 = -1/60

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-19/12 + (-5/8 - 7/24) = -19/12 + (-15/24 - 7/24) = -19/12 - 22/24 = -19/12 -11/12 =

= -30/12 = -5/2

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Ti-au mai ramas ultimele doua de facut. Ca ajutor:

1,0(3) = 1 + 3/90 = 93/90

4,(2) = 4 + 2/9 = 38/9