Question

Aflati ce numar poate fi (a) ,in fiecare caz :
2x10+a=27
9x10+a=96
10x8+a=88
3x10+a=36
5x100+a=520
100x4+a=460
Va rog frumos ajutatima...

Answer 1

20+a=27 a=7
90+a=96 a=6
80+a=88 a=8
30+a=36 a=6
500+a=520 a=20
400+a=460 a=60

Answer 2

2x10+a=27
20+a=27
a=27-20=7
2x10+7=20+7=27(verificare)
9x10+a=96
90+a=96
a=96-90=6
9x10+6=90+6=96(verificare)
10x8+a=88
80+a=88
a=88-80=8
80+8=88(verificare
3x10+a=36
30+a=36
a=36-30=6
30+6=36(verificare)

5x100+a=520
500+a=520
a=520-500=20
500+20=520(verificare)
100x4+a=460
400+a=460
a=460-400=60
400+60=460(verificare)