Răspunsuri

2014-04-03T20:28:11+03:00
Ab+ac=10+18
a(b+c)=28
a(b+c):7=28:7=4
ab-ac=18-10
a(b-c)=8
a(b-c):8=8:8=1
1 5 1
2014-04-03T21:14:58+03:00
Ax(b+c):7 
(axb + axc):7
(18+10):7
28:7=4

ax(b-c):8
(axb - axc):8
(18-10):8
8:8=1
2 2 2