Question

(13)-1-2 x 9+(-11)

17-[(4-(-12))÷(15+(-7))] x (-11)

-3+{[(-8) x (-5)]+12}÷6

Answer 1

(13)-1-2 x 9+(-11)

$= 10 \times ( - 2) \\ = - 20$

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17-[(4-(-12))÷(15+(-7))] x (-11)

$= 17 - ((16) \div (8)) \times ( - 11) \\ = 17 - 2 \times ( - 11) \\ = 17 - ( - 22) \\ = 39$

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-3+{[(-8) x (-5)]+12}÷6

$= - 3 + ((40) + 12) \div 6 \\ = - 3 + 52 \div 6 \\ = \frac{ - 18 + 52}{6} \\ = \frac{34}{6} \\ = \frac{17}{3}$