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Toán Lớp 6: S2 = 1.2 + 2.3 + 3.4 + … 99. 100 S3 = 1.2.3 + 2.3 + 4 + 3 + 3.4.5 + … + 98 x 99.100

Home/ Toán Lớp 6: S2 = 1.2 + 2.3 + 3.4 + … 99. 100 S3 = 1.2.3 + 2.3 + 4 + 3 + 3.4.5 + … + 98 x 99.100

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