Question

100-[36+6*9-(r:3+15)]:3=76

Answer 1

Răspuns:

100-[36+6×9-(r:3+15)] :3=76|-100

[36+6×9-(r:3+15)] :3=24|×3

36+6×9-(r:3+15)=72

36+54-(r:3+15)=72|-36

54-(r:3+15)=36|-54

r:3+15=18/-15

r:3=3

r=3×3

r=9

Sper ca te-am ajutat! :)

Answer 2

Răspuns:  r = 9

Explicație pas cu pas:

100 - [ 36 + 6 × 9 - ( r : 3 + 15 ) ] : 3 = 76

[ 36 + 54 - ( r : 3 + 15 ) ] : 3 = 100 - 76

[ 90 - ( r : 3 + 15 ) ] : 3 = 24

90 - ( r : 3 + 15 ) = 24 × 3

90 - ( r : 3 + 15 ) = 72

r : 3 + 15 = 90 - 72

r : 3 + 15 = 18

r : 3 = 18 - 15

r : 3 = 3

r = 3 × 3

r = 9 → numarul, aflat prin metoda mersului invers

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Verific:

100 - [ 90 - ( 9 : 3 + 15 ) ] : 3 = 100 - ( 90 - 18 ) : 3 = 100 - 24 = 76