efectuează (45÷5+45÷9)÷7+2×10÷10

Răspuns :

(45:5+45:9):7+2*10:10=
(9+5):7+2*1=
14:7+2=
2+2=4
(45:5+45:9):7+2x10:10=
(9+5):7+2x1=
14:7+2=
2+2=
=4