\(B=\frac{270}{13}+\frac{21}{2}+\frac{100}{7}+\frac{1638}{25}\)
\(B=111,07\)
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\(B=\frac{15}{13.18}+\frac{9}{18.21}+\frac{12}{21.25}+\frac{42}{25.39}\)
\(B=\frac{3.5}{13.3.6}+\frac{3.3}{3.6.3.7}+\frac{3.4}{3.7.5.5}+\frac{14.3}{5.5.13.3}\)
\(B=\frac{5}{78}+\frac{1}{42}+\frac{4}{175}+\frac{14}{325}\)
\(B=\frac{35+13}{546}+\frac{53+98}{2275}\)
\(B=\frac{8}{91}+\frac{151}{2275}\)
\(B=\frac{200+151}{2275}\)
\(B=\frac{351}{2275}\)
Vậy \(B=\frac{351}{2275}\)
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