Question

\(\frac{3}{7}.\frac{9}{26}-\frac{1}{14}.\frac{1}{13}-\frac{1}{7}\)

Answer 1

C1:3/7 x 9/26 - 1/14 x 1/13 - 1/7                                       

   =27/182 - 1/182 -1/7

   =26/182 - 1/7

   =0                                                                        

Answer 2

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Answer 3

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Answer 4

mình cần cả lời giải xin lỗi mấy bạn ra kq 0 nhak

Answer 5

\(\frac{3}{7}.\frac{9}{26}-\frac{1}{14}.\frac{1}{13}-\frac{1}{7}\)

=\(\left\{\frac{3}{7}-\frac{1}{7}\right\}.\left\{\frac{9}{26}-\frac{1}{13}\right\}.\frac{1}{14}\)

=\(\left\{\frac{3}{7}+\frac{-1}{7}\right\}.\left\{\frac{9}{26}+\frac{-2}{26}\right\}.\frac{1}{14}\)

= \(\frac{2}{7}.\frac{7}{26}.\frac{1}{14}\)

=\(\frac{2.7.1}{7.26.14}\)=\(\frac{1.1.1}{7.13.2}\)

=\(\frac{1}{182}\)