Câu hỏi của Thị Chuyên Nguyễn

Question

a, $\frac{13}{15}-\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{7}{10}$

Lê Phúc Hưng · Accepted Answer

$\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{13}{15}-\frac{7}{10}$$\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{26}{30}-\frac{21}{30}$$\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{1}{6}$​$\frac{13}{21}+x=\frac{1}{6}:\frac{7}{12}$​​​​$\frac{13}{21}+x=\frac{1.12}{6.7}$$\frac{13}{21}+x=\frac{2}{7}$$x=\frac{2}{7}-\frac{13}{21}$$x=\frac{6}{21}-\frac{13}{21}$$x=\frac{-1}{3}$Câu trả lời: $\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{13}{15}-\frac{7}{10}$$\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{26}{30}-\frac{21}{30}$$\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{1}{6}$​$\frac{13}{21}+x=\frac{1}{6}:\frac{7}{12}$​​​​$\frac{13}{21}+x=\frac{1.12}{6.7}$$\frac{13}{21}+x=\frac{2}{7}$$x=\frac{2}{7}-\frac{13}{21}$$x=\frac{6}{21}-\frac{13}{21}$$x=\frac{-1}{3}$

N · Answer

$\frac{13}{15}-\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{7}{10}$$\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{13}{15}-\frac{7}{10}$$\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{1}{6}$$\frac{13}{21}+x=\frac{1}{6}:\frac{7}{12}$$\frac{13}{21}+x=\frac{2}{7}$$x=\frac{2}{7}-\frac{13}{21}$$x=-\frac{1}{3}$Câu trả lời: $\frac{13}{15}-\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{7}{10}$$\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{13}{15}-\frac{7}{10}$$\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{1}{6}$$\frac{13}{21}+x=\frac{1}{6}:\frac{7}{12}$$\frac{13}{21}+x=\frac{2}{7}$$x=\frac{2}{7}-\frac{13}{21}$$x=-\frac{1}{3}$

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