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(A) 5a-13=3a+5 (c)5+8a=21+4a (e)4a-3=11-3a
(b) 7a+2=4a+17 (d)9+3a=24-2a (f)3a+12=24-5a


Răspuns :

A) 5a-13=3a+5
= 5a-3a=13+5
=2a=18
a=9

C) 5+8a=21+4a
=8a-4a= -5+21
4a=16
a=4

E) 4a-3=11-3a
4a+3a= 3+11
7a=14
a=2

B) 7a +2=4a+17
7a-4a= -2+17
3a=15
a=5

D) 9+3a=24 -2a

9-24= -3a - 2a
-15= -5a
a= 3

F) 3a+12= 24-5a

3a+5a= -12 +24
8a=12
a= 3 supra 2
a)
5a-13=3a+5
5a-3a=5+13
2a=18
a=18÷2
a=9
b)
7a+2=4a+17
7a-4a=17-2
3a=15
a=15÷3
a=5
c)
5+8a=21+4a
8a-4a=21-5
4a=16
a=16÷4
a=4
d)
9+3a=24-2a
3a+2a=24-9
5a=15
a=15÷5
a=3
e)
4a-3=11-3a
4a+3a=11+3
7a=14
a=14÷7
a=2
f)
3a+12=24-5a
3a+5a=24-12
8a=12
a=12/8
a=3/2