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calculati:
a) x+(-2+3-5)-(-7+4-1+x)
b) -x+(-4+7-3)-(-2-x+4-3)
c)-7-(x+14)-(273-9+381)-(-645-x-20)
d) 17+(x-4)-(-7+5+c)+(-2+14)-(-4+30)


Răspuns :

x+(-2+3-5)-(-7+4-1+x)=
x+(-4)-(-4+x)=
x-4+4-x=0

-x+(-4+7-3)-(-2-x+4-3)=
-x+0-(-1-x)=
-x+1+x=1

-7-(x+14)-(273-9+381)-(-645-x-20)=
-7-x-14-645+x+665=666+665=1331

17+(x-4)-(-7+5+c)+(-2+14)-(-4+30)=
17+x-4+2-c+12-26=
x-c+15-14=
x-c+1