La Bombe !

[Matyuv]

671

 

[PluMGMK]

(11)(2^2)(3)(5)+(2^2)(3)

 

[Matyuv]

673

 

[DesLife]

674.

 

[Matyuv]

675

 

[PluMGMK]

2((111)(3)+5)

 

[Matyuv]

677

 

[PluMGMK]

(2^3)+((2^4)(5)-(2)(5))+(2^3)(5^2)(3^1)

 

[Matyuv]

Why do you use so many parentheses?

679

 

[PluMGMK]

Just to be on the safe side.

680

 

[Matyuv]

681

 

[RayLums]

682

 

[Matyuv]

683

 

[PluMGMK]

(2^2)(171)

 

[A10das]

685

 

[Matyuv]

686

 

[PluMGMK]

5((2^7)+(2^3))+7

 

[Matyuv]

688

 

[RayLums]

689

 

[PluMGMK]

3((2^3)(5^2)+(3)(2)(5))