解: 65乘2/5+65乘3/5
=65×(2/5+3/5)
=65×1
=65
75除8/9减35乘4/5
=75÷8/9-35×4/5
=75×9/8-35×4/5
=675/8-28
=675/8-224/8
=451/8
5/12+（5/6减1/12）除9/16
=5/12+9/12×16/9
=5/12+16/12
=21/12
=7/4
祝你开心