1.2345^2+(0.7655)^2+2.469×0.7655-2.5^2

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1.2345^2+(0.7655)^2+2.469×0.7655-2.5^21.2345^2+(0.7655)^2+2.469×0.7655-2.5^21.2345^2+(0.7655)^2+2.46

1.2345^2+(0.7655)^2+2.469×0.7655-2.5^2
1.2345^2+(0.7655)^2+2.469×0.7655-2.5^2

1.2345^2+(0.7655)^2+2.469×0.7655-2.5^2
=1.2345²+2×1.2345×0.7655+0.7655²-2.5²
=(1.2345+0.7655)²-6.25
=4-6.25
=-2.25

-9/4,计算步骤省略。