2/9X12=2/3除以3/2=5/51X17=3/4X5/6除以5/6X3/4=解方程1-2/9x=3/59/16除以x=3/8用自己喜欢的方法计算8/13除以7+1/7X6/134/25X23+4/25X675除以[(2/3+1/5)X1/13]求解答!!!!