(12又2分之1+1又3分之2÷4)-7分之5×7
问题描述：
(12又2分之1+1又3分之2÷4)-7分之5×7
答
(12又2分之1+1又3分之2÷4)-7分之5×7
=25/2+5/3÷4-5
=150/12+5/12-60/12
=(150+5-60)/12
=95/12
=7又12分之11