a) \(\frac{7}{18}+\frac{4}{23}+\frac{11}{18}+\frac{19}{23}\)
\(=\left(\frac{7}{18}+\frac{11}{18}\right)+\left(\frac{4}{23}+\frac{19}{23}\right)\)
\(=1+1\)
\(=2\)
b) \(\frac{19}{15}+\frac{31}{23}-\frac{4}{15}-\frac{8}{23}\)
\(=\left(\frac{19}{15}-\frac{4}{15}\right)+\left(\frac{31}{23}-\frac{8}{23}\right)\)
\(=1+1\)
\(=2\)
ủng hộ tớ nha
a) (7/18+11/18)+(4/23+19/23)
=18/18+23/23
=1+1
=2
b)=2
7/18+4/23+11/18+19/23
=(7/18+11/18)+(4/23+19/23)
= 1 + 1
= 2
19/15+31/23-4/15-8/23
=(31/23-8/23)+(19/15-4/15)
= 1 + 1
= 2
