Question

Se considera numerele
A=a^2+x+2
B=3a^2+2x-7
C=4x+12
a)A+B
b)A-B
c)A+B+C
d)A+(B-C)
e)-A+B-C
f)(A-B)+(B-C)+(C-A)

Answer 1

A=a²+x+2
B=3a²+2x-7
C=4x+12
a)A+B=a²+x+2+3a²+2x-7=4a²+3x-5
b)A-B=a²+x+2-3a²-2x+7=-2a²-x+9
c)A+B+C=4a²+3x-5+4x+12=4a²+7x+7
d)A+(B-C)=A+B-C=4a²+3x-5-4x-12=4a²-x-17
e)-A+B-C=-a²-x-2+3a²+2x-7-4x-12=2a²-3x-21
f)(A-B)+(B-C)+(C-A)=A-B+B-C+C-A=0