Question

urgente me ajudem por favor a:5+(2+3)=(□+2)+3 b:7+(6+4)=(7+6)+(□) c:2+(□+5)=(□+1)+5 d:8+(9+□)=(□+9)+3 e:□+(2+1=(5+□)+□ f:a+(b+c)=(□+□)+ c g:(5+3)+7=5+(□+□) h:m+(n+3)=(□+□)+□​

Answer 1

Resposta:

a:5+(2+3)=(□+2)+3

5+(2+3) = 5 + 5 = 10 ->  (□+2)+3 = (5+2)+3 = 10

b:7+(6+4)=(7+6)+(□) =

7+(6+4) = 7 + 10 = 17 -> (7+6)+(□) = 13 + 4 = 17

c:2+(□+5)=(□+1)+5

2+(□+5) = 2 + 1+5 = 8 -> (□+1)+5 = 2+1 +5 = 8

d:8+(9+□)=(□+9)+3

8+(9+□) = 8 + 9 + 3 = 20 -> (□+9)+3 = 8 + 9 +3 = 20

e:□+(2+1=(5+□)+□

□+(2+1) = 5 + 2 + 1 = 8 -> (5+□)+□ = 5 + 2 + 1 = 8

f:a+(b+c)=(□+□)+ c

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g:(5+3)+7=5+(□+□)

(5+3)+7 = 8+7 = 15 -> 5+(□+□) = 5+7+3 = 15

h:m+(n+3)=(□+□)+□​

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