Question

PLS AM MARE NEVOIE DAU 100 DE PUNCTE SI COROANA​

Answer 1

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

=x-4+4-x=0+0=0

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

C)-7-(x+14)-(273-9+381)-(-645-x-20)=

= -7-x-14-645-(-665-x)= -7-x-14-645+665+x= -1

D)17+(x-4)-(-7+5+x)+(-2+14)-(-4+30)=

=17+x-4-(-2+x)+12-26=17+x-4+2-x+12-26=1