/-1又2/3/×(0.5-2/3)÷1又1/9

问题描述:

/-1又2/3/×(0.5-2/3)÷1又1/9
要过程

原式=5/3×(2/3-1/2)÷10/9
=5/3×1/6×9/10
=(5×9)/(3×6×10)
=1/4