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(4+8+12+...+396):(25-5×2)
urgent dau coroana


Răspuns :

(4+8+12+...+396):(25-5×2) =

= [4 ×(1+2+3+...+99)] : (25 - 10) =

= [4× 99 × (99+1) : 2] : 15 =

= (4 × 99 × 100 : 2) : 15 =

= (396 × 50) : 15 =

= 19 800 : 15 =

= 1 320