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Afla nr. necunoscut

(a-180)x10=200

30x6-16:2-b=19

(c+15):5=64:8


Răspuns :

(a-180)x10=200
a-180=200:10
a-180=20
a=20+180
a=200

30x6-16:2-b=19
180-8-b=19
172-b=19
b=172-19=153

(c+15):5=64:8
(c+15):5=8
c+15=8×5
c+15=40
c=40-15
c=25
(a-180)x10=200 <=> a-180=20 <=> a=200

30x6-16:2-b=19 <=> b=30*6-16:2-19 <=> b=180-8-19 <=> b=153

(c+15):5=64:8 <=> c+15=8*5 <=> c+15=40 <=> c=25