Question

12
-13-15) - 2 )
14) { 30+ [10-5+ (-2-3)] -18 -12) =
15) 20+{[7+5+ (-9+7)+3])=
16) -4- {2+(-3-(-1+7)]+2) =
17) 10 - (-2+[ +1 + ( +7 - 3) - 2] +6}=
18) -2--3-(-5) + 1] - 18 =
19) -20-{-4-1-8 + ( +12-6-2) +2+3 ]=
20) {[(-50-10) + 11 + 19 ] + 20 } + 10 =
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Answer 1

Resposta:

14) 0

15) 33

16) 1

17) 1

18) −11

19) -16

20) 0

Explicação passo-a-passo:

14) {30+[5+(−5)]−18−12)=  

={30+[0]−18−12)=

={30−18−12)=

={12−12)=

=0

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15) 20+{[12+(−2)+3])=  

=20+{[10+3])=

=20+{[13])=

=33

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16) −4−{2+(−3−(6)]+2)=  

=−4−{2+(−9]+2)=

=−4−{−7+2)=

=−4−{−5)=

=1

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17) 10−(−2+[+1+(+4)−2]+6}=  

=10−(−2+[+5−2]+6}=

=10−(−2+[+3]+6}=

=10−(1+6}=

=10−(7}=

=3

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18) [1−(−5)+1]−18=  

=[6+1]−18=

=[7]−18=

=−11

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19) −20−{−5−8+(+6−2)+2+3]=  

=−20−{−13+(+4)+2+3]=

=−20−{−9+2+3]=

=−20−{−7+3]=

=−20−{−4]=

=−16

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20) {[(−60)+11+19]+20}+10=  

={[−49+19]+20}+10=

={[−30]+20}+10=

={−10}+10=

=0

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Espero ter ajudado.