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Afla valoarea : 800 : [ 425 - 13 x ( 48 :4 ) - (89 + a x 4 ) ] = 10 DAU COROANA

Răspuns :

800:[425-13x6-(89+ax4)]=10
800:[425-78-(89+ax4)]=10
[425-78-(89+ax4)]=800:10⇒80
78-(89+ax4)=425-80⇒345
(89+ax4)=345-78⇒267
ax4=267-89
ax4=178
a=178:4
a=44,5