afla nr necunoscute a×2×4=832 822:(a-18)=6
(A+27)×3=90
(A×6):8=87


Răspuns :

a×2×4=832
a=(832:4):2
a=104

(A+27)×3=90
A+27=90:3=30
A=30-27
A=3

(A×6):8=87
A×6=87×8=696
A=696:6
A=116