Question

can tro giup gap

A=\(\frac{5}{13}+\frac{-5}{7}+\frac{-20}{41}+\frac{8}{13}+\frac{-21}{41}\)

Answer 1

\(A=\frac{5}{13}+\frac{-5}{7}+\frac{-20}{41}+\frac{8}{13}+\frac{-21}{41}\)

\(A=\left(\frac{5}{13}+\frac{8}{13}\right)+\left(-\frac{20}{41}+\frac{-21}{41}\right)+\left(-\frac{5}{7}\right)\)

\(A=1+\left(-1\right)-\frac{5}{7}\)

\(A=0+\left(-\frac{5}{7}\right)\)

\(A=-\frac{5}{7}\)

Answer 2

A=5/13-5/7-20/41+8/13-21/41

A=5/13+8/13-20/41-21/41-5/7

A=13/13-41/41-5/7

A=1-1-5/7

A=0-5/7

A=-5/7

Vậy A=-5/7

tk nha bn

Answer 3

2 ban oi

Answer 4

\(\frac{-5}{7}\)