1.=（3/4+1/4）×5/2 =9/4×2/3+3/4×2/3 =10/3+2/3×12/5=1×5/2 =3/2+1/2 =10/3+8/5=5/2 =2 =74/152.13/14x=13 4/5x=8/15 9x=18/11x=13×14/13 x=8/15×5/4 x=18/11×1/9x=14 x=2/3 x=2/113.660×1/6×5/11=50（人...