tinh nhanh (1+1/1x3)x(1+1/2x4)x(1+1/3x5)x(1+1/4x6)x(1+1/6x7)

tinh nhanh (1+1/1x3)x(1+1/2x4)x(1+1/3x5)x(1+1/4x6)x(1+1/6x7)
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