Răspuns :
Răspuns:
ex 8.
142+257= 399
150-20=130
399-130= 269
ex 9.
856-530=326
141+202= 343
326+343= 669
Ex 8:
(142+257)-(150-20)=269
399 - 130 =269
Ex 9:
(856-530)+(141+202)=669
326 + 343 =669
(142+257)-(150-20)=269
399 - 130 =269
Ex 9:
(856-530)+(141+202)=669
326 + 343 =669