Tính:
a) 2,5% + 10,34% ; b) 56,9% - 34,25% ; c) 100% -23% - 47,5%.
a) 2,5% + 10,34% = 12,84% ;
b) 56,9% - 34,25% = 22,65% ;
c) 100% - 23% - 47,5% = 77% - 47,5% = 29,5%.
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