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a=?, b=ax3, c=ax5, d=150, a+d=(b+c):2

Răspuns :

MaraMaruta28
a=?
b=ax3
c=ax5
d=150
a+d=(b+c):2

a+150=(ax3+ax5):2
a+150=(3a+5a):2
a+150=8a:2
a+150=4a
a+4a=150
5a=150
a=150:5
a=30

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