Решите лёгким способом

Question

Решите лёгким способом

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Answer 1

16 * (20 + 3) * (100 + 60 +5) =
= (320 + 48)* (100 + 60 + 5) =
= 320 * 100 + 320 * 60 + 320 * 5 + 48 * 100 + 48 * 60 + 48 * 5 =
= 32000 + 19200 + 1600 + 4800 + 2880 + 240 =
= 51200 + 6400 + 3120 = 57600 + 3120 = 60720