作业帮先化简再求值：t/(t+1)-(t²-1)/【(t+2)²-1】*(t+3)/(t+1),其中t=（根号2）-1
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先化简再求值：t/(t+1)-(t²-1)/【(t+2)²-1】*(t+3)/(t+1),其中t=（根号2）-1
先化简再求值：t/(t+1)-(t²-1)/【(t+2)²-1】*(t+3)/(t+1),其中t=（根号2）-1
先化简再求值：t/(t+1)-(t²-1)/【(t+2)²-1】*(t+3)/(t+1),其中t=（根号2）-1
t/(t+1)-(t²-1)/【(t+2)²-1】*(t+3)/(t+1)
=t/(t+1-(t+1)(t-1)/(t+2+1)(t+2-1)x(t+3)/(t+1)
=t/(t+1)-(t+1)(t-1)/(t+3)(t+1)x(t+3)/(t+1)
=t/(t+1)-(t-1)/(t+1)
=1/(t+1)
=1/[(根号2）-1+1]
=(根号2)/2
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