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Răspuns :

5.a) (a-180)×10=200

a-180=200:10

a-180=20

a=180+20

a=200

b) 30×6-16:2-b=19

180-8-b=19

172-b=19

b=172-19

b=153

c)(c+15):5=64:8

(c+15):5=8

c+15=5×8

c+15=40

c=40-15

c=25

6. 35:5=7

7. nu am stiut , scuze

7. Prima coloana:20;10;16;5

A doua coloana:3;24;1;48