(1+0.4567+0.5678)×(0.4567+0.5678+0.6789)-(1+0.4567+0.5678+0.6789)×(0.4567+0.5678)=
问题描述:
(1+0.4567+0.5678)×(0.4567+0.5678+0.6789)-(1+0.4567+0.5678+0.6789)×(0.4567+0.5678)=
答
设0.4567+0.5678=t
则:
原式=(1+t)(t+0.6789)-(1+t+0.6789)*t
=t(1+t)+0.6789(1+t)-t(1+t)-0.6789t
=0.6789