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- 9 - 7 -3 = - 19
2.-) +8 - (-10)+ (-7)=
+8 + 10 -7 =
+18 - 7 =
+ 11
9=1/9 7= 1/7 -3=-1/3
forma direca sumas directo
9+7-3= 13------- 1/13 respuesta
1/9+1/7-1/3..........=1/13