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a fost răspuns

calculeaza: 800:[425-13×(48:4)-(89+a×4)]=10
coroana+15puncte

Răspuns :

Deeeeeeeea
 800:[425-13×(48:4)-(89+a×4)]=10
800:[425-3x12-(89+ax4)]=10
800:[425-156-(89+ax4)]=10
800:[296-89-ax4]=10
800:[180-ax4]=10
180-ax4=80
ax4=180-80
ax4=100
a=25