1/2x5/5
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A = \(\dfrac{1}{1\times2}\) + \(\dfrac{3}{2\times5}\) + \(\dfrac{5}{5\times10}\) + \(\dfrac{4}{10\times14}\) + \(\dfrac{6}{14\times20}\)
A = \(\dfrac{1}{1}\) - \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) - \(\dfrac{1}{5}\) + \(\dfrac{1}{5}\) - \(\dfrac{1}{10}\) + \(\dfrac{1}{10}\) - \(\dfrac{1}{14}\) + \(\dfrac{1}{14}\) - \(\dfrac{1}{20}\)
A = \(\dfrac{1}{1}\) - \(\dfrac{1}{20}\)
A = \(\dfrac{19}{20}\)
6 x5/3=10 7:8/4+1/3=23/6 2x5/8-1/2=3/4 3/7:5/6x1/4=9/70
a)
5 8 x + 2 5 = 1 5 5 8 x = 1 5 − 2 5 5 8 x = − 1 5 x = − 1 5 : 5 8 x = − 1 5 . 8 5 x = − 8 25
b)
5 7 : x + 11 7 = 18 7 5 7 : x = 18 7 − 11 7 5 7 : x = 1 x = 5 7 : 1 x = 5 7
c)
2 x 5 − 1 : − 5 = 1 7 2 x 5 − 1 = 1 7 . − 5 2 x 5 − 1 = − 5 7 2 x 5 = − 5 7 + 1 2 x 5 = 2 5 x = 2 5 : 2 5 x = 1
a)
5 8 x + 2 5 = 1 5 5 8 x = 1 5 − 2 5 5 8 x = − 1 5 x = − 1 5 : 5 8 x = − 1 5 . 8 5 x = − 8 25
b)
5 7 : x + 11 7 = 18 7 5 7 : x = 18 7 − 11 7 5 7 : x = 1 x = 5 7 : 1 x = 5 7
c)
2 x 5 − 1 : − 5 = 1 7 2 x 5 − 1 = 1 7 . − 5 2 x 5 − 1 = − 5 7 2 x 5 = − 5 7 + 1 2 x 5 = 2 5 x = 2 5 : 2 5 x = 1
a,\(\frac{5}{8}x+\frac{2}{5}=\frac{1}{5}\)
\(< =>\frac{5}{8}x=\frac{1}{5}-\frac{2}{5}\)
\(< =>\frac{5}{8}x=-\frac{1}{5}\)
\(< =>x=-\frac{1}{5}:\frac{5}{8}=-\frac{8}{25}\)
5/5=1
=> 1/2*5/5=1/2*1=1/2
\(\frac{1}{2}x\frac{5}{5}=\frac{1}{2}x1=\frac{1}{2}\)