Question

D.Calculati :
1.) 9-5-(7-13)-{5-[6+(3-9)-3]+12}=
2)4-3-{5+[6-7-(3-5+9)+(3-7)]}=
3) 13-{14-15+[(16-17)+2-5]-(-5+7)}=
4)-9+{5-9-[13-(4-8)+(7+3-12)]-(-9)}=​

Answer 1

Răspuns:

1.) 9-5-(7-13)-{5-[6+(3-9)-3]+12}=

9-5-(-6)-{5-[6+(-6)-3]+12}=

9-5+6-[5-(6-6-3)+12]=

9-5+6-[5-(-3)+12]=

9-5+6-(5+3+12)=9-5+6-20=9+6-5-20=

15-25=-10

2)4-3-{5+[6-7-(3-5+9)+(3-7)]}=

4-3-{5+[6-7-(12-5)+(-4)]}=

4-3-[5+(6-7-7-4)]=4-3-[5+(6-18)]=

4-3-(5-12)=4-3-(-7)=4-3+7=4+7-3=11-3=8

3) 13-{14-15+[(16-17)+2-5]-(-5+7)}=

13-{14-15+[(-1)+2-5]-2}=13-[14-15+(2-1-5)-2]=

13-(14-15-4-2)=13-(-7)=13+7=20

4)-9+{5-9-[13-(4-8)+(7+3-12)]-(-9)}=

-9+{5-9-[13-(-4)+(10-12)]+9}=

-9+[5-9-(13+4-2)+9]=

-9+(5-9-15+9)=-9+(5+9-9-15)=

-9+(5-15)=-9-10=-19