1) Calcule o valor das expressões seguintes.
a) [4-2.(3-7)]:(-2)-5
b) 1-[7-(4-3.2).(-1-1)][.5
a) [4-2.(3-7)]:(-2)-5
b) 1-[7-(4-3.2).(-1-1)][.5
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[4-2(-4)] :(-7) =
[4 +8 ] :(-7) =
12 :(-7) = -12/7
b) 1-[7 - (4-3.2).(-1-1)][.5] =
1-[7 - (4 - 6 ).( -2 )].5 =
1-[7 - ( -2 ) . (-2 )].5 =
1-[7 + 2 . ( -2 )].5 =
1-[7 -4 ].5 =
1- [ -3 ].5 =
1 - [-15] = 1 + 15 = 16
[ 4-2.(-4)] : (-2)-5
[4+ 8] : (-2)-5
12 : (-2)-5
-24-5
-29
b) 1-[7-(4-3.2).(-1-1)].5
1-[ 7-(4-6). (-2)].5
1-[ 7-(-2).(-2)]. 5
1-[7-(+4)].5
1-[7-4].5
1-3.5
1-15
-14