请解，大神

更新时间2022-01-02 06:38:51

0.3*（20%-14%）²+0.6*（15%-14%）²+0.1（-10%-14%）²

0.3 * ( 20% - 14% )^2 + 0.6 * ( 15% - 14% )^2 + 0.1 * ( -10% - 14% )^2

= 0.3 * 0.06^2 + 0.6 * 0.01^2 + 0.1 * 0.24^2

= 0.0069

= 0.69% 。

0.3×(20%-14%)²+0.6×(15%-14%)²+0.1×(-10%-14%)²

=0.3×0.06²+0.6×0.01²+0.1×(-0.24)²

=0.3×0.0036+0.6×0.0001+0.1×0.0576

=0.00108+0.00006+0.00576

=0.0069

0.3*（20%-14%）²+0.6*（15%-14%）²+0.1（-10%-14%）²

=0.3×(6/100)²+0.6×(1/100)²+0.1×(24/100)²

=(10.8+0.6+57.6)/10000

=69/10000

=0.0069