Question

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

Answer 1

Mình không ghi lại đầu bài nhé bạn 

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

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

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

Answer 2

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

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

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

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

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

CHÚC BN HỌC TỐT!!!!

Answer 3

= (5/13+8/13)+(-20/41+(-21/41))+(-5/7)

= 13/13+ (-41/41)+(-5/7)

= 1+(-1)+(-5/7)

= -5/7

k cho mình nha!!!

Answer 4

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

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

\(=\frac{13}{13}+\frac{-41}{41}+\frac{-5}{7}\)

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

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

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