计算5x/y乘y/15x² 1/x-1+1/1+x c/ab-a/bc

计算5x/y乘y/15x² 1/x-1+1/1+x c/ab-a/bc
计算5x/y乘y/15x² 1/x-1+1/1+x c/ab-a/bc

计算5x/y乘y/15x² 1/x-1+1/1+x c/ab-a/bc
5x/y乘y/15x²
=1/3x
1/x-1+1/1+x
=(x+1+x-1)/(x-1)(x+1)
=2x/(x²-1)
c/ab-a/bc
=（c²-a²）/abc