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Ma puteti ajuta,uitati problema:
a+a=b
b-c=d
d÷e=f
f+f=50
Va rog ajutati-mă nu dau de cap.


Răspuns :

a+a=b=>2a=b
b-c=d=>2a-c=d
d÷e=f=>(2a-c)÷e=f
f+f=50=>2f=50=>f=25

d÷e=f , îl inlocuim pe f
d÷e=25=>d=25e
2a=b
2a-c=25e
25e÷e=25=>e=25×25
e=625
d=25e=>d=25×625
d=15625
b-c=15625=>2a-c=15625
2a=15625-c
b=15625+c
stim ca 2a=b=>15625-c=15625+c
15625-15625=c+c
0=2c=>c=0
b=15625+0=>b=15625
2a=15625=>a=15625÷2
a=78125
verificare
a+a=b
78125+78125=15625
b-c=d
15625-0=15625
d÷e=f
15625÷625=25
f+f=50
25+25=50

a=78125
b=15625
c=0
d=15625
e=625
f=25