\(A=\frac{40}{31.39}+\frac{35}{39.16}+\frac{30}{23.92}+\frac{25}{29.64}\) ; \(B=\frac{91}{19.31}+\frac{65}{19.43}+\frac{39}{989}+\frac{143}{1311}\).
Tính tỉ số A/B
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Tính : \(A=\frac{40}{31.39}+\frac{35}{39.46}+\frac{30}{46.52}+\frac{25}{52.57}\)
Ta có : \(A=\frac{40}{31.39}+\frac{35}{39.46}+\frac{30}{46.52}+\frac{25}{52.57}=5\left(\frac{8}{31.39}+\frac{7}{39.46}+\frac{6}{46.52}+\frac{5}{52.57}\right)\)
\(=5\left(\frac{1}{31}-\frac{1}{39}+\frac{1}{39}-\frac{1}{46}+\frac{1}{46}-\frac{1}{52}+\frac{1}{52}-\frac{1}{57}\right)=5\left(\frac{1}{31}-\frac{1}{57}\right)=5.\frac{26}{1767}=\frac{130}{1767}\)
\(A=\frac{40}{31.39}+\frac{35}{39.46}+\frac{30}{46.52}+\frac{25}{52.57}\)
Thực hiện hợp lí nhé
\(A=5\left(\frac{8}{31.39}+\frac{7}{39.46}+\frac{6}{46.52}+\frac{5}{52.57}\right)=8\left(\frac{1}{31}-\frac{1}{39}+\frac{1}{39}-\frac{1}{46}+\frac{1}{46}-\frac{1}{52}+\frac{1}{52}-\frac{1}{57}\right)\)=\(8\left(\frac{1}{31}-\frac{1}{57}\right)=8\left(\frac{26}{1767}\right)=\frac{208}{1767}\)
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208/1767
tich tớ nhé 
Nguyễn Trọng Đức Siu Đệp Choai
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Tìm tỉ số giữa A và B, biết:
\(A=\frac{40}{31.39}+\frac{35}{39.46}+\frac{30}{46.52}+\frac{25}{52.57};B=\frac{91}{19.31}+\frac{65}{19.43}+\frac{39}{23.43}+\frac{143}{69.19}\)
\(A=\frac{40}{31}-\frac{40}{39}+\frac{35}{39}-\frac{35}{46}+\frac{30}{46}-\frac{30}{52}+\frac{25}{52}-\frac{25}{57}\)
\(A=\frac{1}{31}-\frac{1}{39}+\frac{1}{39}-\frac{1}{46}+\frac{1}{46}-\frac{1}{52}+\frac{1}{52}-\frac{1}{57}\)
\(A=\frac{1}{31}-\frac{1}{57}\)
tiếp theo tính A và B tương tự rồi tìm tỉ số, ta lấy A:B*100=?%
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tính nhanh mình tích cho
tính tỉ số \(\frac{M}{N}\) biết M = \(\frac{-40}{31.39}+\frac{-35}{39.46}+\frac{-30}{46.52}+\frac{-25}{52.57}\)
N = \(\frac{1}{31.33}+\frac{1}{33.35}+\frac{1}{35.37}+...+\frac{1}{55.57}\)
Tìm tỉ số \(\frac{A}{B}\) biết:
a) \(A=\frac{4}{31.7}+\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}\) ; \(B=\frac{7}{19.31}+\frac{5}{19.43}+\frac{3}{23.43}+\frac{11}{23.57}\)
b) \(A=\frac{40}{31.39}+\frac{35}{39.46}+\frac{30}{46.52}+\frac{25}{52.57}\); \(B=\frac{91}{19.31}+\frac{65}{19.43}+\frac{39}{23.43}+\frac{143}{69.19}\)
\(\frac{1}{5}+\frac{4}{10}+\frac{9}{15}+\frac{16}{20}+\frac{25}{25}+\frac{36}{30}+\frac{49}{35}+\frac{64}{40}+\frac{81}{45}\)=?
\(\frac{1}{5}+\frac{4}{10}+...+\frac{81}{45}=\frac{1}{5}+\frac{2}{5}+\frac{3}{5}+...+\frac{9}{5}=\frac{1+2+3+...+9}{5}=\frac{45}{5}=9\)
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1/5 + 4/10 + 9/15 + 16/20 + 25/25 + 36/30 + 49/35 + 64/40 + 81/45
=1/5 + 2/5 + 3/5 + 4/5 + 5/5 + 6/5 + 7/5 + 8/5 + 9/5
=45/5 = 9
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Cho A=\(\frac{40}{31.38}+\frac{35}{39.46}+\frac{30}{2392}+\frac{25}{2962}\) và B=\(\frac{91}{19.31}+\frac{65}{19.43}+\frac{39}{989}+\frac{143}{1311}\).Tìm \(\frac{A}{B}\)
Tính tổng:
E =\(\frac{40}{31.38}+\frac{35}{39.46}+\frac{30}{2392}+\frac{25}{2962}\)
F =\(\frac{91}{19.31}+\frac{65}{19.43}+\frac{39}{989}+\frac{143}{1311}\)
Tính tổng:
E =\(\frac{40}{31.38}+\frac{35}{39.46}+\frac{30}{2392}+\frac{25}{2962}\)
F =\(\frac{91}{19.31}+\frac{65}{19.43}+\frac{39}{989}+\frac{143}{1311}\)