6又1/3÷5/12+2又2/5×4又2/3-240%

6又1/3÷5/12+2又2/5×4又2/3-240%
6又1/3÷5/12+2又2/5×4又2/3-240%

6又1/3÷5/12+2又2/5×4又2/3-240%
6又1/3除以5/12+2又2/5x4又2/3--240%
=6又1/3x12/5+12/5x4又2/3--12/5
=12/5x[6又1/3+4又2/3--1]
=12/5x10
=24

6又1/3÷5/12+2又2/5×4又2/3-240%
=6又1/3×12/5+7/5×4又2/3-12/5
=（6又1/3+4又2/3-1）×12/5
=10×12/5
=24