Question

am nevoie de ajutor va rog ​

Answer 1

Exercițiul 3:

a) 20a-17a+a=3a+a=4a

b) 9a+2a-13a=11a-13a=-2a

c) - 5b+b+3b=-4b+3b=-b

d) 5b-(-2b)+8b=5b+2b+8b=7b+8b=15b

e) 19c-12c-(7c)=7c-(7c)=0

f)-(-3c)+(-2c)-(4c)+5c=3c-2c-(4c)+5c=2c

Exercițiul 4:

a) 2a-3a-4=-a-4

b) x-5+6x-4=x-6x-5-4=-5x+1

c) - 2a+3x+5a-9x=-2a+5a+3x-9x=3a-6x

d) 11a+3x-12x-4a=11a-4a+3x-12x=7a-9x

e) 3a-2+a+3-5a-1=3a+a-5a-2+3-1=-a-0=-a

f)-2x+7x-5a-4x+4a=-2x+7x-4x-5a+4a=x-(-a)=x+a