Question

Ex 5 dau coroana rapid

Answer 1

a-b=6

a)x+3a-3b=20

x+3(a-b)=20

x+3*6=20=>x=20-18=2

b)ax-bx+9a-9b=654

x(a-b)+9(a-b)=654

(a-b)(x+9)=654

6(x+9)=654

x+9=109=>x=100

c)7a-7b+x=55

7(a-b)+x=55

7*6+x=55=>x=55-42=13

d)13+x-(5a-5b)=2011

13+x-5(a-b)=2011

x-5*6=2011-13

x-30=1998

x=2028

Incearca sa nu mai acoperi subpunctele data viitoare.