说æï¼^2ââ表示平æ¹
解ï¼h=1/2gt^2
1/2gt^2-1/2g(t-1)^2=3/4
t^2-(t^2-2t+1)=3/(2g)
2t-1=3/(2g)
2t=3/(2g)+1
t=(3+2g)/(4g)
h=1/2gt^2
=1/2g[(3+2g)/(4g)]^2
=(9+12g+4g^2)/(32g)
=(9+12Ã10+4Ã10^2)/(32Ã10)
=529/320
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