Calcule o valor das expressões.
a) -3 +7 +4
B)+1 (-4) +(-6)
C)-10 +20+ (-8)
D)(-3)+2+(-4)+(-6)
E)0,6+1,2+(- 1 )+ ( -2)
( 2 ). ( 5 )
F)2+3+( -4 )
(. 3 )
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