Cho \(A=\frac{4}{7.31}+\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}+\frac{1958}{57.403}\)
\(B=\frac{7}{19.31}+\frac{5}{19.43}+\frac{3}{23.43}+\frac{13}{23.59}+\frac{1957}{29.2015}\)
Tinh \(\frac{82A}{5B}\)
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Cho \(A=\frac{4}{7.31}+\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}+\frac{1958}{57.403}\)
\(B=\frac{7}{19.31}+\frac{5}{19.43}+\frac{3}{23.43}+\frac{13}{23.59}+\frac{1957}{29.2015}\)
Tính \(\frac{82A}{5B}\)
Cho A=\(\frac{4}{7.31}+\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}+\frac{1958}{57.403}\)
B\(\frac{7}{19.31}+\frac{5}{19.43}+\frac{3}{23.43}+\frac{13}{23.59}+\frac{1957}{29.2015}\)
Giups mình với. Chiều nay thi toán kì II có câu này mình ko làm được, tiếc quá
Tính \(\frac{82A}{5B}\)
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Cho A=4/7.31+6/7.41+9/10.41+7/10.57+1958/57.403
B=7/19.31+5/19.43+3/23.43+13/23.59+1957/29.2015
Tính 82A/5B
tính tỉ số \(\frac{a}{b}\)\(b=\frac{7}{19.31}+\frac{5}{19.43}+\frac{3}{23.43}+\frac{11}{23.57}\)\(a=\frac{4}{7.31}+\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}\)
Tính tỉ số A/B biết
A=\(\frac{4}{7.31}+\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}\)
B=\(\frac{7}{19.31}+\frac{5}{19.43}+\frac{5}{23.43}+\frac{11}{23.57}\)
nhân A với 5
nhân B với 2
Tỉ số là 5/2 bạn tự giải đầy đủ nhé mình ko bít viết kí hiệu PS
Chúc bạn học tốt!!
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Cho hai biểu thức;
A=\(\frac{4}{7.31}+\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}\)
B=\(\frac{7}{19.31}+\frac{5}{19.43}+\frac{3}{23.43}+\frac{11}{23.57}\)
Tinh ti so \(\frac{A}{B}\)
\(A=\frac{4}{7.31}+\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}\)
\(=\frac{20}{35.31}+\frac{30}{35.41}+\frac{45}{50.41}+\frac{35}{50.57}\)
\(=5\left(\frac{4}{35.31}+\frac{6}{35.41}+\frac{9}{50.41}+\frac{7}{50.57}\right)\)
\(=5\left(\frac{1}{31}-\frac{1}{35}+\frac{1}{35}-\frac{1}{41}+\frac{1}{41}-\frac{1}{50}+\frac{1}{50}-\frac{1}{57}\right)\)
\(=5\left(\frac{1}{31}-\frac{1}{57}\right)\)
\(B=\frac{7}{19.31}+\frac{5}{19.43}+\frac{3}{23.43}+\frac{11}{23.57}\)
\(=\frac{14}{34.31}+\frac{10}{38.43}+\frac{6}{46.43}+\frac{22}{46.57}\)
\(=2\left(\frac{7}{34.31}+\frac{5}{38.43}+\frac{3}{46.43}+\frac{11}{46.57}\right)\)
\(=2\left(\frac{1}{31}-\frac{1}{34}+\frac{1}{34}-\frac{1}{43}+\frac{1}{43}-\frac{1}{46}+\frac{1}{46}-\frac{1}{57}\right)\)
\(=2\left(\frac{1}{31}-\frac{1}{57}\right)\)
\(\Rightarrow\frac{A}{B}=\frac{5\left(\frac{1}{31}-\frac{1}{57}\right)}{2\left(\frac{1}{31}-\frac{1}{57}\right)}=\frac{5}{2}\)
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Tính A/B biết: A=\(\frac{4}{7.31}+\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}\)
B=\(\frac{7}{19.31}+\frac{5}{19.43}+\frac{3}{23.43}+\frac{11}{23.57}\)
A= \(\frac{4}{7.31}\)+ \(\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}\)
B=\(\frac{7}{19.31}+\frac{5}{19.43}+\frac{3}{23.43}+\frac{11}{23.67}\)
Tính A , B
tính A = \(\frac{4}{7.31}+\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}+\frac{1958}{57.403}\)
Đáp án là \(\frac{64}{403}\)bạn nhé !
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A= 5 x (4/31.7.5 + 6/7.5.41 + 9/41.10.5 + 7/ 10.5.57 + 1958/57.403.5)
= 5 x (4/31.35 + 6/35.41 + 9/41.50 + 7/50.57 + 1958/57.2015)
=5 x (1/31 - 1/35 + 1/35 - 1/41 + 1/41 - 1/50 + 1/50 - 1/57 + 1/57 - 1/2015)
= 5 x (1/31 - 1/2015)
= 5 x (65/2015 - 1/2015)
= 5 x 64/2015
= 320/2015 = 64/403
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