tính: C=1.99+2.98+3.97+....+98.2+99.1 D=1.3+2.4+3.5+....+97.99+98.100

tính: C=1.99+2.98+3.97+....+98.2+99.1 D=1.3+2.4+3.5+....+97.99+98.100
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