Tính nhanh 15 . 64 + 25 . 100 + 36 . 15 + 60 . 100
15 . 64 + 25 . 100 + 36 . 15 + 60 . 100
= (15 . 64 + 36 . 15) + (25 . 100 + 60 . 100)
= 15. (64 + 36) + 100. (25 + 60)
= 15 . 100 + 100 . 85
= 100 . (15 + 85)
= 100 . 100
= 10000
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