计算:(y-x-1)÷(x-y-1).(结果不含负整数指数幂)

问题描述:

计算:(y-x-1)÷(x-y-1).(结果不含负整数指数幂)

原式=(y−

1
x
)÷(x−
1
y
)
=
xy−1
x
÷
xy−1
y

=
xy−1
x
y
xy−1

=
y
x