4分之5-7分之6+14分之3x3分之2

问题描述:

4分之5-7分之6+14分之3x3分之2

4分之5-7分之6+14分之3x3分之2
=5/4-6/7+1/7
=5/4-(6/7-1/7)
=5/4-5/7
=15/28