﹙1﹚2分之3-x÷5分之2=4分之3 -x÷2/5=3/4-3/2-x÷2/5=-3/4x÷2/5=3/4x=3/4×2/5x=3/10 (10分之3)
﹙2﹚原式=﹙9/14×7/2+1/6﹚÷﹙40/3-15/4×16/5﹚÷21/4×4/21=﹙9/4+1/6﹚÷﹙40/3-12﹚×4/21×4/21=29/12×3/4×4/21×4/21=39/441
﹙3﹚3x+10=8x-5 3x-8x=-5-10-5x=-15x=3
﹙4﹚3又20分之7÷[5又4分之3-4.5×﹙20%+3分之1﹚]
=67/20÷[23/4-9/2×(1/5+1/3)]=67/20÷(23/4-9/2×8/15)=67/20÷(23/4-12/5)=67/20÷67/20=1