85=0.064T²+1.8T求t值

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85=0.064T²+1.8T求t值85=0.064T²+1.8T求t值85=0.064T²+1.8T求t值85=0.064T^2+1.8T0.064T^2+1.8T-8

85=0.064T²+1.8T求t值
85=0.064T²+1.8T
求t值

85=0.064T²+1.8T求t值
85=0.064T^2+1.8T
0.064T^2+1.8T-85=0
代入求根公式得T=[-1.8±√(1.8^2+4*0.064*85)]/(2*0.064)
=(-1.8±5)/0.128
所以T=(-1.8+5)/0.128=25
或T=(-1.8-5)/0.128=-53.125