Urgent dau coroana si 5 stele daca rezolvati asta pana maine la 2

Răspuns:
1. 90 - 30=60
2. 1/4*10/100*80=1/4*8=2
3. 4 numere prime
4. P=6*m=6*5=30
6. 10-6=4 km
II. 2. a+b=130 a= 3b+2
3b+2+b=130 4b=128 => b=128:4=32
a= 3*32+2=98 a= 98 b= 32