1.t/(t+1)-(t^2-1)/[(t+2)^2-1]乘以(t+3)/(t+1)
=t/(t+1)-（t+1）（t-1)/(t+2+1)(t+2-1)乘以t+3)/(t+1)
=t/(t+1)-1
=(t-t-1)/(t+1)
=-1/(t+1)
2.-(√-m^3）-[m√(-1/m)]
=-√-m(m^2)-√m^2(-1/m)
=-m√-m-√-m
=(-m-1)(-√-m)
=（m+1）√-m
(和您的结果完全一致）!
二次根式的乘除（二）初三开学刚教高手进
1.t/(t+1)-(t^2-1)/[(t+2)^2-1]乘以(t+3)/(t+1)
=t/(t+1)-（t+1）（t-1)/(t+2+1)(t+2-1)乘以t+3)/(t+1)
=t/(t+1)-1
=(t-t-1)/(t+1)
=-1/(t+1)
2.-(√-m^3）-[m√(-1/m)]
=-√-m(m^2)-√m^2(-1/m)
=-m√-m-√-m
=(-m-1)(-√-m)
=（m+1）√-m
(和您的结果完全一致）!