Răspunsuri

2014-10-31T16:11:13+02:00
A) 5a-3a=13+5 => 2a=18=> a= 18:2 a=9
b) 7a-4a=17-2 => 3a=15 a =15:3 a=5
c)8a-4a=21-5 4a=16 a =16:4 a=4
d) 3a+2a= 24-9 5a= 15 a=15:5 a=3
f)3a+5a=34-2 8a=32 a=32:4 a=8
e)4a+3a =11+3 7a=14; a=14:2 a=7