Răspuns:
1. 3
2. 3 lei
3. 43847
4. D28={1, 2, 4, 7, 14, 28}
5. 0
6. 100
7. 54+27=81
87a-87b-54c=87(a-b)-54c=87×54-54×27=54(87-27)=60=>54×60=3240
8. n={0, 2, 4, 6, 8}
430, 432, 434, 436, 438
9. 27^2+3×3^28:9^13=(3^3)^2+3^1+28:(3^2)^13=3^6+3^29:3^26=3^6+3^29-26=3^6+3^3=729+27=746
10. a:b=4 rest 17
a=4×b+17
a-b=3872
4b+17-b=3872
3b+17=3872
3b=3872-17
3b=3855
b=3855:3
b=1285
a×1285=3975
a=3875+1285
a=4157
11. L=1+8=>l=L-8
P=2L+2(L-8)=4L-16
4L-16=1208=>L=1224:4=306
P dreptunghi=4×306
P dreptunghi=1224
