Question

VA ROG REPEDE DAU CORONITA!!!!!!!!!!!!!!

Answer 1

20.
a=1 nr
b=nr 2
2a-3b=-9  ⇒a=(3b-9)/2
3a-2b=-26
3(3b-9)/2-2b=-26
9b-27-4b=-52
5b=-25
b=-5
a=(3b-9)/2=(-15-9)/2=-12

22.
a+b=126500
a=b+6500
b+6500+b=126500
2b=120000
b=60000
a=66500

21. nu prea inteleg figura  
liniutele  ce reprezinta.....
presupun ca x = 3*3,5=10,5
46-(10,2)*2=25
y=25:2=12,5