Question

(1+0.4567+0.5678)×(0.4567+0.5678+0.6789)－(1+0.4567+0.5678+0.

Answer 1

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