Mathematical problems about calculators 4 /(1 ab/c 4 - 1 ab/c 3 )=?A、48 B、-48 C、28 D、-28 The / after 4 above means divide by

Mathematical problems about calculators 4 /(1 ab/c 4 - 1 ab/c 3 )=?A、48 B、-48 C、28 D、-28 The / after 4 above means divide by

The answer should be: B, - 48
4÷(1/4 -1/3)= -48
You can use Casio fx-82es & nbsp; or fx-82es & nbsp; plus series calculators, and the operation is very convenient