tìm x biết: x + 1/2 + 1/6 + 1/12 + 1/20 + 1/30 = 47/42 04/09/2021 Bởi Eva tìm x biết: x + 1/2 + 1/6 + 1/12 + 1/20 + 1/30 = 47/42
x + $\frac{1}{2}$ + $\frac{1}{6}$ + $\frac{1}{12}$ + $\frac{1}{20}$ + $\frac{1}{30}$ = $\frac{47}{42}$ x + ($\frac{1}{1.2}$ + $\frac{1}{2.3}$ + $\frac{1}{3.4}$ + $\frac{1}{4.5}$ + $\frac{1}{5.6}$) = $\frac{47}{42}$ x + (1 – $\frac{1}{2}$ + $\frac{1}{2}$ – $\frac{1}{3}$ +…+ $\frac{1}{5}$ – $\frac{1}{6}$) = $\frac{47}{42}$ x + ( 1 – $\frac{1}{6}$) = $\frac{47}{42}$ x + $\frac{5}{6}$ = $\frac{47}{42}$ x = $\frac{47}{42}$ – $\frac{5}{6}$ x = $\frac{2}{7}$ Bình luận
x+$\frac{1}{2}$+$\frac{1}{6}$+$\frac{1}{12}$+$\frac{1}{20}$+$\frac{1}{30}$=$\frac{47}{42}$ x+($\frac{1}{1.2}$+$\frac{1}{2.3}$+$\frac{1}{3.4}$+$\frac{1}{4.5}$+$\frac{1}{5.6}$)=$\frac{47}{42}$ x+(1-$\frac{1}{2}$+$\frac{1}{2}$-$\frac{1}{3}$+$\frac{1}{3}$-$\frac{1}{4}$+$\frac{1}{4}$-$\frac{1}{5}$+$\frac{1}{5}$-$\frac{1}{6}$)=$\frac{47}{42}$ x+(1-$\frac{1}{6}$)=$\frac{47}{42}$ x+$\frac{5}{6}$=$\frac{47}{42}$ x=$\frac{47}{42}$-$\frac{5}{6}$ x=$\frac{2}{7}$ Bình luận
x + $\frac{1}{2}$ + $\frac{1}{6}$ + $\frac{1}{12}$ + $\frac{1}{20}$ + $\frac{1}{30}$ = $\frac{47}{42}$
x + ($\frac{1}{1.2}$ + $\frac{1}{2.3}$ + $\frac{1}{3.4}$ + $\frac{1}{4.5}$ + $\frac{1}{5.6}$) = $\frac{47}{42}$
x + (1 – $\frac{1}{2}$ + $\frac{1}{2}$ – $\frac{1}{3}$ +…+ $\frac{1}{5}$ – $\frac{1}{6}$) = $\frac{47}{42}$
x + ( 1 – $\frac{1}{6}$) = $\frac{47}{42}$
x + $\frac{5}{6}$ = $\frac{47}{42}$
x = $\frac{47}{42}$ – $\frac{5}{6}$
x = $\frac{2}{7}$
x+$\frac{1}{2}$+$\frac{1}{6}$+$\frac{1}{12}$+$\frac{1}{20}$+$\frac{1}{30}$=$\frac{47}{42}$
x+($\frac{1}{1.2}$+$\frac{1}{2.3}$+$\frac{1}{3.4}$+$\frac{1}{4.5}$+$\frac{1}{5.6}$)=$\frac{47}{42}$
x+(1-$\frac{1}{2}$+$\frac{1}{2}$-$\frac{1}{3}$+$\frac{1}{3}$-$\frac{1}{4}$+$\frac{1}{4}$-$\frac{1}{5}$+$\frac{1}{5}$-$\frac{1}{6}$)=$\frac{47}{42}$
x+(1-$\frac{1}{6}$)=$\frac{47}{42}$
x+$\frac{5}{6}$=$\frac{47}{42}$
x=$\frac{47}{42}$-$\frac{5}{6}$
x=$\frac{2}{7}$