Question

Caluculeaza , apoi verifica facand proba prin operatia inversa 4 1 26 + 3527= , 5273+ 2112= , 5829 +1993 = , 4870- 3430 = , 1786+1897 =, 4132+3255 = , 3420-2550= ,3500-2400=,​

Answer 1

Răspuns:

4126+3527= 7653

P: 7653-3527=4126

5273+ 2112=7385

P: 7385-2112=5273

5829 +1993 = 7822

P: 7822-1993=5829

4870- 3430 =1440

P: 1440+3430=4870

1786+1897 =3683

P:3683-1897=1786

4132+3255 =7387

P: 7387-3255=4132

3420-2550=870

P:870+2550=3420

3500-2400=1100

P:1100+2400=3500