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Afla numarul necunoscut: (100-b:3)x5=490 (c:9:3)x4=20

Răspuns :

Anetud
(100-b:3)x5=490
100-b:3=490:5
100-b:3=98
b:3=100-98
b:3=2
b=3x2
b=6

(c:9:3)x4=20
(c:3)=5
c=3x5
c=15

Coco0987
(100-b:3)x5=490
100-b:3=490:5
100-b:3=98
b:3=100-98
b:3=2
b=2x3
b=6

(c:9:3)x4=20
c:9:3=20:4
c:3=5
c=5x3
c=15

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