Câu hỏi của Ngô thanh ngân

Question

B=1/5-3/7+5/9-2/11+7/13-9/16-7/13+2/11-5/9+3/7-1/5

Cố lên Tân · Accepted Answer

$B=\left(\frac{3}{7}+-\frac{3}{7}\right)+\left(\frac{1}{5}-\frac{1}{5}\right)+\left(\frac{5}{9}+\frac{5}{9}\right)+\left(\frac{2}{11}+-\frac{2}{11}\right)+\left(\frac{7}{13}-\frac{7}{13}\right)-\frac{9}{16}$$B=0+0+0+0+0+\frac{9}{16}$$B=0+\frac{9}{16}$$B=\frac{9}{16}$ Câu trả lời: $B=\left(\frac{3}{7}+-\frac{3}{7}\right)+\left(\frac{1}{5}-\frac{1}{5}\right)+\left(\frac{5}{9}+\frac{5}{9}\right)+\left(\frac{2}{11}+-\frac{2}{11}\right)+\left(\frac{7}{13}-\frac{7}{13}\right)-\frac{9}{16}$$B=0+0+0+0+0+\frac{9}{16}$$B=0+\frac{9}{16}$$B=\frac{9}{16}$

Trần Thị Loan · Answer

$B=\left(\frac{1}{5}-\frac{1}{5}\right)+\left(-\frac{3}{7}+\frac{3}{7}\right)+\left(\frac{5}{9}-\frac{5}{9}\right)+\left(-\frac{2}{11}+\frac{2}{11}\right)+\left(\frac{7}{13}-\frac{7}{13}\right)-\frac{9}{16}$$B=0+0+0+0+0+\frac{9}{16}=\frac{9}{16}$Câu trả lời: $B=\left(\frac{1}{5}-\frac{1}{5}\right)+\left(-\frac{3}{7}+\frac{3}{7}\right)+\left(\frac{5}{9}-\frac{5}{9}\right)+\left(-\frac{2}{11}+\frac{2}{11}\right)+\left(\frac{7}{13}-\frac{7}{13}\right)-\frac{9}{16}$$B=0+0+0+0+0+\frac{9}{16}=\frac{9}{16}$

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