Toán Lớp 7: A = 1/100 – 1/100.99 – 1/99.98 + … + 1/3.2 + 1/2.1
Giúp mk nốt bài này nha. 22h mk phải nộp rùi
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Toán Lớp 7: A = 1/100 – 1/100.99 – 1/99.98 + … + 1/3.2 + 1/2.1
Giúp mk nốt bài này nha. 22h mk phải nộp rùi
Comments ( 2 )
= 1/100 – (1/100.99 + 1/99.98 + 1/98.97-……+ 1/3.2 +1/2.1)
= 1/100.99 + 1/99.98 + 1/98.97-……+ 1/3.2 +1/2.1
=> C = 1/100 – B
1/2.1 = 1/1 – 1/2
1/3.2 = 1/2 – 1/3
1/99.98 = 1/98 – 1/99
1/100.99 = 1/99 – 1/100
B= 1 – 1/100
=> A = 1/100 – ( 1 – 1/100)
= 1/50 – 1
= -49/50