Răspuns :
Răspuns:
(a•3-16)÷7+(9•11)=116
=(a•3-16)÷7+99=116
=(a•3-16)÷7= 116-99=17
=a•3-16=17•7=119
a•3=119+16=135
a= 135÷3=45
Explicație pas cu pas:
[(a×3)-16] ÷7 +9×11=116
=[(a×3)-16]÷7+99=116
=[(a×3)-16]÷7=116-99
=[(a×3)-16]÷7=17
=[(a×3)-16=17×7
=[(a×3)-16]=119
=[(a×3)]=119+16
=[(a×3)]=1917
a=1917:3=639(a)