(1-t)^3=1-3t+3t^2-t^3?如何化简得

(1-t)^3
=(1-t)(1-t)(1-t)
=(1-2t+t²)(1-t)
=1-t-2t+2t²+t²-tO
=1-3t+3t²-t³
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(1-t)^3=1-3t+3t^2-t^3
=0

（1-t)^3
=(1-t)^2×(1-t)
=(1-2t+t^2)(1-t)
=1-t-2t+2t^2+t^2-t^3
=1-3t+3t^2-t^3