a,25/100 +19/22+19/35+3/4+3/22+16/35
=(19/22+3/22)+(19/35+16/35)+(25/100+3/4)
= 22/22 + 35/35 + ( 1/4 + 3/4)
= 22/22 + 35/35 + 4/4
= 1 + 1 + 1
= 3
b, 2/5 : 4/7 - 2/5 : 2/3
=(2/5 - 2/5) : (4/7 : 2/3)
= 0 : 6/7
=0
tất cả các số kia là đều phần hết
1) \(\frac{25}{100}+\frac{19}{22}+\frac{19}{35}+\frac{3}{4}+\frac{3}{22}+\frac{16}{35}\)
\(=\frac{1}{4}+\frac{19}{22}+\frac{19}{35}+\frac{3}{4}+\frac{3}{22}+\frac{16}{35}\)
\(=\left(\frac{1}{4}+\frac{3}{4}\right)+\left(\frac{19}{22}+\frac{3}{22}\right)+\left(\frac{19}{35}+\frac{16}{35}\right)\)
\(=1+1+1\)
\(=3\)
2) \(\frac{2}{5}:\frac{4}{7}-\frac{2}{5}:\frac{2}{3}\)
\(=\frac{2}{5}:\left(\frac{4}{7}-\frac{2}{3}\right)\)
\(=\frac{2}{5}:\frac{-2}{21}\)
\(=-\frac{21}{5}\)
=))
