Question

PESSOAL, ME AJUDEM PF, COMO RESOLVER ESSAS EXPRESSÕES?
20+3x(-2)-5x(-8)-10
2-(-7+2x5):(-1)
16-30:[6-2x(3-1)+3]

Answer 1

$20+3.(-2)-5.(-8)-10 = 20-6+40-10=60-16= 44 \\ \\ \\ \frac{2-(-7+2.5)}{-1} = \\ \\ \frac{2-(-7+10)}{-1}= \\ \\ \frac{2-3}{-1}= \\ \\ \frac{-1}{-1}= 1 \\ \\ \\ \frac{16-30}{[6-2(3-1)+3]} = \\ \\ \frac{-14}{[6-2.2+3]} = \\ \\ \frac{-14}{[6-4+3]} = \\ \\ \frac{-14}{5}$