5/14×（14/25+28）
=5/14×14/25+5/14×28
=1/5+10
=10又1/5
3/5×8/9÷5/8
=8/15×8/5
=64/75
7/9÷1/2÷35/36
=14/9×36/35
=8/5
=1又3/5
7÷70%
=7÷0.7
=10
4/23×16+16×19/23
=16×（4/23+19/23）
=16×1
=16
5/12×28%×3/14
=5/12×（28%×3/14）
=5/12×3/50
=1/40
5/14×（14/25+28）
=5/14×14/25+5/14×28
=1/5+10
=10又1/5
3/5×8/9÷5/8
=8/15×8/5
=64/75
7/9÷1/2÷35/36
=14/9×36/35
=8/5
=1又3/5
7÷70%
=7÷0.7
=10
4/23×16+16×19/23
=16×（4/23+19/23）
=16×1
=16
5/12×28%×3/14
=5/12×（28%×3/14）
=5/12×3/50
=1/40