Răspuns:
10. a=70 b=4 rest 1 c=1
5. ?
11. a)6 b)6 c)7 d)1.010
Explicație pas cu pas:
10. a=60+60:2-20 a=60+30-20 a=90-20 a=70
b=(1+17x4):17 b=(1+68):17 b=69:17 b=4 rest 1
c=(37x3-37):74 c=(111-37):74 c=74:74 c=1
5. a+4xb-3xc+33
a+4b-3c+33 trebuie sa fie si un rezultat daca este un exercitiu cu necunoscute
11. a) (12+X)+14=4xX-4 (12+X)+14=4X-4 12+14=5X-4 26=5X-4 26+4=5X 30=5X
1X= 30:5 1X=6
b) (3xX+2):4-2=3 (3X+2):4-2=3 (3X+2):4=3+2 (3X+2):4=5 3X+2=5x4 3X+2=20 3X=20-2 3X=18 1X=18:3 1X=6
c) [(X+3)x3+3]x3+3=102 [(X+3)x3+3]x3=102-3 [(X+3)x3+3]x3=99 (X+3)x3+3=99:3 (X+3)x3+3=33 (X+3)x3=33-3 (X+3)x3=30 X+3=30:3 X+3=10 X=10-3 X=7
d)5xX:2=2525 5X:2=2525 5X=2525x2 5X=5.050 1X=5.050:5 1X=1.010
