Respostas

2014-05-06T10:57:54-03:00
100-{2 x[18-(4 x 2 -6)]}=
100-{2 x[18-2]}=
100-{2 x 16}=
100 - 32 = 68

(-1 -2) x [-7 x (2-5)-3 x (4 -2) x 1]=
- 3 x [-7 x (-3) -3 x 2 x 1]=
-3 x [ 21 -3 x 2 ]=
-3 x [ 21 -6 ]=
-3 x 15 = - 45

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