9.
(85-a)×2=10
85-a=10:2
85-a=5
a=85-5
a=80
(45:b):3=3
45:b=3×3
45:b=9
b=45:9
b=5
(c:7):8=56
c:7=56×8
c:7=448
c=448×7
c=3136
80+5+3136=3221 (suma celor 3 nr.)
13.
Numarul MMCMXL scris cu cifre arabe este 2940
15.
2+6×8=2+48=50
a=50
(50+36:9):9=b
(50+4):9=b
54:9=6
b=6
6×18+9×18-36=c
108+162-36=c
270-36=234
c=234
234:2+222:2-201=d
117+111-201=d
228-201=27
d=27
27:3×2+(81:9+71:1)=e
9×2+(9+71)=e
18+80=98
e=98
98+5×[4+3×(2+16:2)]=f
98+5×[4+3×(2+8)]=f
98+5×[4+3×10]=f
98+5×[4+30]=f
98+5×34=f
98+170=268
f=268
•Sper ca te-am ajutat•
