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Opreastefanya
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rezolvati desfasurat: (17- a ):2=5 ; 54:b:3=3 ; (75-15:c)-5x10=20

Răspuns :

(17-a):2=5
(17-a)=5×2
(17-a)=10
a=17-10
a=7

54:b:3=3
54:b=3×3
54:b=9
b=54:9
b=6

(75-15:c)-5×10=20
(75-15:c)-50=20
(75-15:c)=20+50
(75-15:c)=70
15:c=75-70
15:c=5
c=15:5
c=3
Cristinamocanu791

(17-a):2=5 \×2

=> 17-a=10 \-17

=> a= -7


54:b:3=3 \×3

=> 54:b=9

=> b=54:9

=> b=6


(75-15:c)-5×10=20

(75-15:c)-50=20 \+50

75-15:c=70 \-75

15:c=-5

=>c=-3

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