Question

A-B=2
B-D=9
B+D-A=6.Sa se afle A,B,D​ ​

Answer 1

A-B=2;

B-D=9;

A-B+B-D=11 => A-D=11;

B+A-D=6 <=> B+11=6 => B=-5

A=2-5 => A=-3;

D=9-(-5) => D=14;

V: B+A-D=-5+-3-14=-8+14=6;

Answer 2

Explicație pas cu pas:

A-B=2=>A=B+2|=>A=D+11

B-D=9=>B=D+9|=>

înlocuim:

B-D-A=6

(D+9+D)-D+11=6

2D+9-(D+11)=6

D-2=6

D=2+6

D=8

B=8+9=17

A=17+2=19

V:A-B=19-17=2

V:17-8=9

V:17+8-19=25-19=6