7352-6407=945
a)7352-(6407-300)=1245
7352-6107=1245
b)(7352-300)-6407=1245
7652-6407=1245
c)(7352+300)-6407=1245
7652-6407=1245
d)7352-(6407+300)=645
7352-6707=645
e)(7352+300)-(6407+300)=950
7652-6707=950
f)(7352-300)-(6407+300)=945
7052-6107=945
P.S. daca vrei poti sa scri si fara paranteze