resolva as expressões (com os cálculos)

a) 166- { [- 10- ( -8 -9 ) - ( -10 ) ] } =

b) -189 + { 12 - [ -9 - ( -7 -8) +14] -3 } +20=

C) -8 - { -4 - [-8 - ( -5 -4 ) + 14] -3 } + 20=

calcule as hipotenusas e as áreas dos triângulos retângulos, cujos catetos são:
(com cálculos)

a) 60m e 30m

b) 45m e 60m

c) 25m e 50m

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