a)
-42+(_)=47
(_)=47+42
(_)=89
b) se puede resolver con la resta 89-42=-47
c)cualquier resta se puede resolver mediante una suma con de negativos (restas)
1)
(_)+(-13)=43
(_)=43+13
(_)= 56
2)
(25)+(_)=-31
(_)=31-25
(_)= -56
3)
(-13)+(_)=-105
(_)= -105+13
(_)= -92
4)
(24)+(_)=59
(_)=59-24
(_)=35
5)
(38)+(_)=-42
(_)=-42-38
(_)=-80
(73)-(58)=15
(43)-(56)=-13
(-31)-(25)=-56
(-105)-(-13)=-105+13=-92
(59)-(24)=35
(-80)-(-42)=38
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Verified answer
a)
-42+(_)=47
(_)=47+42
(_)=89
b) se puede resolver con la resta 89-42=-47
c)cualquier resta se puede resolver mediante una suma con de negativos (restas)
suma
1)
(_)+(-13)=43
(_)=43+13
(_)= 56
2)
(25)+(_)=-31
(_)=31-25
(_)= -56
3)
(-13)+(_)=-105
(_)= -105+13
(_)= -92
4)
(24)+(_)=59
(_)=59-24
(_)=35
5)
(38)+(_)=-42
(_)=-42-38
(_)=-80
resta
(73)-(58)=15
(43)-(56)=-13
(-31)-(25)=-56
(-105)-(-13)=-105+13=-92
(59)-(24)=35
(-80)-(-42)=38