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Question

Tìm y biết:$\left(\frac{2}{1x3}+\frac{2}{3x5}+\frac{2}{5x7}+\frac{2}{7x9}+\frac{2}{9x11}\right)\cdot y=\frac{2}{3}$

Hoàng Thị Tuyết Nhung · Accepted Answer

$\left(\frac{2}{1x3}+\frac{2}{3x5}+\frac{2}{5x7}+\frac{2}{7x9}+\frac{2}{9x11}\right).y=\frac{2}{3}$$\left(1-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+\frac{1}{9}-\frac{1}{11}\right)y=\frac{2}{3}$$\left(1-\frac{1}{11}\right).y=\frac{2}{3}$$\frac{10}{11}.y=\frac{2}{3}$$y=\frac{2}{3}.\frac{11}{10}$$y=\frac{22}{30}$Câu trả lời: $\left(\frac{2}{1x3}+\frac{2}{3x5}+\frac{2}{5x7}+\frac{2}{7x9}+\frac{2}{9x11}\right).y=\frac{2}{3}$$\left(1-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+\frac{1}{9}-\frac{1}{11}\right)y=\frac{2}{3}$$\left(1-\frac{1}{11}\right).y=\frac{2}{3}$$\frac{10}{11}.y=\frac{2}{3}$$y=\frac{2}{3}.\frac{11}{10}$$y=\frac{22}{30}$

Pikachu · Answer

$\left(\frac{2}{1x3}+\frac{2}{3x5}+\frac{2}{5x7}+\frac{2}{7x9}+\frac{2}{9x11}\right).y=\frac{2}{3}$         $\frac{10}{11}.y=\frac{2}{3}$                    $y=\frac{11}{15}$Câu trả lời: $\left(\frac{2}{1x3}+\frac{2}{3x5}+\frac{2}{5x7}+\frac{2}{7x9}+\frac{2}{9x11}\right).y=\frac{2}{3}$         $\frac{10}{11}.y=\frac{2}{3}$                    $y=\frac{11}{15}$

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