Tính nhanh:
a) 46 + 17 + 54;
b) 4.37.25;
c) 87.36 + 87.64;
Ta có:
a) 46 + 17 + 54 = ( 46 + 54 ) + 17 = 100 + 17 = 117
b) 4.37.25 = ( 4.25 ).37 = 100 . 37 = 3700
c) 87 . 36 + 87 . 64 = 87 . ( 36 + 64 ) = 87 . 100 = 8700
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