(1+0.2345)(1+0.2345)+(1—0.2345)(1—0.2345)+2(1+0.2345)(1—0.2345)
=1.2345*((1+0.2345)+(1—0.2345))+0.7655*((1—0.2345)+(1+0.2345))
=1.235*2+0.7655*2
=2*(1.2345+0.7655)
=4
(1+0.2345)(1+0.2345)+(1—0.2345)(1—0.2345)+2(1+0.2345)(1—0.2345)
=1.2345*((1+0.2345)+(1—0.2345))+0.7655*((1—0.2345)+(1+0.2345))
=1.235*2+0.7655*2
=2*(1.2345+0.7655)
=4