Question

[Kanzaki Mizuki]

4/3x7 + 5/7x12 + 1/12x13 + 7/13x20 + 3/20x23

Giải ra cho mình nhé

Answer 1

[Bảo Bình Mei]

  4/3x7 + 5/7x12 + 1/12x13 + 7/13x20 + 3/20x23

=1/3-1/7+1/7-1/12+1/12-1/13+1/13-1/20+1/20-1/23

=1/3-1/23

=20/69

Answer 2

[𝐓𝐡𝐮𝐮 𝐓𝐡𝐮𝐲𝐲]

Kanzaki Mizuki

\(=\frac{1}{3}-\frac{1}{7}+\frac{1}{7}-\frac{1}{12}+\frac{1}{12}-\frac{1}{13}+\frac{1}{13}-\frac{1}{20}+\frac{1}{20}-\frac{1}{23}\)

\(=\frac{1}{3}-\frac{1}{23}\)

\(=\frac{20}{69}\)