Question

Cine ma ajuta cu rezolvarea completa?

Answer 1

$\displaystyle a=-12+(7-16)-[-5-(13-20)+15]-(7-13) \\ a=-12+(-9)-[-5-(-7)+15]-(-6) \\ a=-21-(2+15)-(-6) \\ a=-21-17-(-6) \\ a=-38-(-6) \\ a=-32 \\ b=14-[7-5-(-8+13-16)-(3-8)]-(-9) \\ b=14-[2-(5-16)-(-5)]-(-9) \\ b=14-[2-(-11)-(-5)]-(-9) \\ b=14-[13-(-5)]-(-9) \\ b=14-18-(-9) \\ b=-4-(-9) \\ b=5$