Question

CALCULE AS EXPRESSÕES NUMÉRICA!!! ME AJUDEM!!!

a) ( -7 /8 ) - ( -3/4 )
e) 15-{ -3+[(5-6)²X (9-8)²+1]}

Answer 1

a) ( -7 /8 ) - ( -3/4 ) =
      - 7/8 + 3/4 = -----mmc(4,8) = 8
      - 7/8 + 6/8 = - 1/8


e) 15-{ -3+[(5-6)²X (9-8)²+1]} =
    15- {-3+[(-1)² x (1)² + 1]} =
    15- {-3+[ 1 x 1 + 1]} =
    15- {-3+[ 1 + 1]} =
    15- {-3+ 2} =
    15- {-1} =
    15 + 1 = 16

Answer 2

a) (-7/8) -(-3/4)                                   
= -7/8 + 3/4   ( Faz MMC)
=-7+6/8
=-1/8
b) 15-{-3+[(5²-2x6x5+6²)x(9²-2x9x8+8²)+1]}
=15-{-3+[(25-60+36)x(81-144+64)+1]}
=15-{-3+[1x1+1]}
=15-{-3+2}
=15-{-1}
=15+1=16