Răspuns :

Kitty200704id

505 x (5+ 100 : 10 x 3: 6x8:4:2) =(4 x 5 : 2 x3 : 6+5) x 505 /:505

5+ 100 : 10 x 3: 6x8:4:2=4 x 5 : 2 x3 : 6+5

5+ 10 x 3: 6x8:4:2=20 : 2 x3 : 6+5

5+ 30: 6x8:4:2=10 x3 : 6+5

5+ 5x8:4:2=10 x3 : 6+5

5+ 40:4:2=30 : 6+5

5+ 10:2=5+5

5+5=5+5

10=10

Lucasoancea2007id

Explicație pas cu pas:

505×(5+10×3:6×2:2)=(20:2×3:6+5)×505

505×(5+30:6:1)=(10×3:6+5)×505

505×(5+5)=(30:6+5)×505

505×10=(5+5)×505

5050=10×505

5050=5050✔

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