Toán Lớp 6: S3= 21 + 23+ 25+………+1001
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Toán Lớp 6: S3= 21 + 23+ 25+………+1001
Comments ( 2 )
S3 có : (1001 – 21)/2 + 1 = 491 (số hạng)
=> S3 = (21 + 1001).491/2 = 250901