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\(\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}:\frac{1}{5}\)
\(=\frac{2\times3\times4}{3\times4\times5}:\frac{1}{5}\)
\(=\frac{2}{5}:\frac{1}{5}\)
\(=\frac{2}{5}\times5\)
\(=2\)
\(\frac{1}{2}+x=\frac{5}{6}\)
\(x=\frac{5}{6}-\frac{1}{2}\)
\(x=\frac{5}{6}-\frac{3}{6}\)
\(x=\frac{2}{6}\)
\(x=\frac{1}{3}\)
\(\frac{1}{2}+x=\frac{5}{6}\)
\(x=\frac{5}{6}-\frac{1}{2}\)
\(x=\frac{5}{6}-\frac{3}{6}\)
\(x=\frac{2}{6}\)
\(x=\frac{1}{3}\)
Vậy \(x=\frac{1}{3}\)
B1:Tính nhanh
1/3+1/6+1/12+1/24+1/48+1/96=?
Nhớ viết cách tính ra nhé
Ai làm nhanh nhất thì mình tk cho
B = 1/3 + 1/6 + 1/12 + 1/24 + 1/48 + 1/96
2B = 2(13+16+112+124+148+196)=23+13+16+112+124+148
B = 2B - B
= (23+13+16+112+124+148)−(13+16+112+124+148+196)
= (23+13+16+112+124+148)−13−16−112−124−148−196
= 23−196=21/32
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = (9 + 1) + (8 + 2) + (7 + 3) + (6 + 4) + 5
= 10 + 10 + 10 + 10 + 5 = 45
\(\frac{3}{4}x\frac{4}{5}:\frac{3}{5}x\frac{6}{7}:\frac{1}{7}x\frac{5}{6}\)\(=\)\(\frac{3}{4}x\frac{4}{5}x\frac{5}{3}x\frac{6}{7}x\frac{7}{1}x\frac{5}{6}\)\(=\)\(\frac{3x4x5x6x7x5}{4x5x3x7x1x6}\)\(=\)\(\frac{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x5}{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x1}\)\(=\)\(\frac{5}{1}\)\(=\)\(5\).
\(\frac{5}{6}-\frac{1}{3}-\frac{1}{6}\)
\(=\left(\frac{5}{6}-\frac{1}{6}\right)-\frac{1}{3}\)
\(=\frac{2}{3}-\frac{1}{3}\)
\(=\frac{1}{3}\)