Răspuns:
a+560=780
a=780-560
a= 220
b+2340=5687
b=5687-2340
b=3347
c-2315=1324
c=1324+2315
c=3639
d-345=1300
d=1300+345
d=1645
4500+e=6800
e=6800-4500
e=2300
325+f=330
f=330-325
f=5
6500-g=2300
g=6500-2300
g=4200
8784-h=4326
h=8784-4326
h=4458
ex 10
6540-2427-1845=4113-1845=2268