Question

Exercitiile 1,2,3,4,5 si 1 de jos.Va rog ofer 50 puncte.

Answer 1

1)
127-21=106 doarece 106+21=127 si 127-106=21
4.456-3287=1.169 deoarece 4.456-1.169=3.287si 3287+1.169=4.456
6.427-5.777=650  deoarece 650+5.777=6.427 si 6.427-650=5.777
95.681-2017=93664 deoarece 93.664+2017=95681si 95681-93664=2017
45.631-29.876=15.755 deoarece 15.755+29.876=45631si45631-15755=29876

2)
1000-376=624
7.312-398=7.212
45631-29876-1001=15.755-1001= 14.754


3)

5+12=17
24-17=7
24-12-5=7

3456+2017=5473
5674-5473=201
5674-3456-2017=201

se observa ca daca scadem suma din paranteza  sau diferenta numerelor ne da acelasi rezultat

4)
143-45=98
234-98=136
234-143+45=136


123-23=100
1.000-123-23=854
1000-123+23=854

5)
103+?=643
643-103=540
103+540=643

576-?=329
576-329=147
576-147=329

?-445=718
718+445=1.163
1.163-445=718

?+3029=6049
6049-3029=3020
3020+3029=6049


6) 554-273=281



1)
1032-986=46
347+4965=2017+3295

3.334-(312+865)=(3.334-312)-865=2157