四分之三除以三分之二与六分之五的和,
设商是x (用方程解)
3/4 = ( 2/3 + 5/6 ) x
3/4 = (4/6 + 5/6 ) x
3/4 = ( 9/6 ) x = 3/2 x
x = 3/4 x 2/3 = 2分之1