Toán Lớp 5: Bài 1.
1/3+1/6+1/12+1/24+1/48
Bài 2
A=1/3+1/9+1/27+1/71
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Toán Lớp 5: Bài 1.
1/3+1/6+1/12+1/24+1/48
Bài 2
A=1/3+1/9+1/27+1/71
Comments ( 2 )
Giải đáp:
#Clickbim
Câu 1 :
1/3 + 1/6 + 1/12 + 1/24 + 1/48 -> Nhân mẫu sao cho bằng 48
= 16/48 + 8/48 + 4/48 + 2/48 + 1/48
= (16+8+4+2+1)/48
= 31/48
Câu 2 :
A = 1/3 + 1/9 + 1/27 + 1/71
A = 4/9 + 1/27 + 1/71
A = 13/21 + 1/71
A = 950/1917
Lời giải và giải thích chi tiết:
$ a) \dfrac{1}{3} + \dfrac{1}{6} + \dfrac{1}{12} + \dfrac{1}{24} + \dfrac{1}{48} = \dfrac{16}{48} + \dfrac{8}{48} + \dfrac{4}{48} + \dfrac{2}{48} + \dfrac{1}{48} = \dfrac{31}{48} $
$ b) \dfrac{1}{3} + \dfrac{1}{9} + \dfrac{1}{27} + \dfrac{1}{81} = \dfrac{27}{81} + \dfrac{9}{81} + \dfrac{3}{27} + \dfrac{1}{81} = \dfrac{40}{81} $