x+5/9=17/18 两边乘以182x+10=17x=7/2x+5/6=11/12 两边乘以122x+10=11x=1/26/7-x=1/6 两边乘以42 36-42x=742x=29x=29/422/3+x=7/9 两边乘以96+9x=7x=1/9[7/8-x3/4=?] 0.48x+12=48两边除以0.124x+100=4004x=300x=75...7/8-x=3/4两边乘以8
7-8x=6
8x=1
x=1/8