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標題:
maths
發問:
1. solve the equation log (x^3+1) =2.42. solve the equation log3x+logx9 =33. simplify (2sina cos^3a) /(sin2a) + sina cosa tana4. solve the equation cos2a=3sina+2 0
1. Solve the equation log (x^3+1) =2.4 Sol x^3+1=10^2.4 x^3+1=251.1887 x^3=250.11887 x=6.3 2. Solve the equation log3_x+logx_9 =3 Sol Set log3_x=p p+2/p=3 p^2-3p+2=0 (p-1)(p-2)=0 p=1 or p=2 log3_x=1 or log3_x=2 x=3 or x=9 3. Simplify (2SinaCos^3 a)/(Sin2a)+SinaCosaTana Sol (2SinaCos^3 a)/(Sin2a)+SinaCosaTana =(2SinaCos^3 a)/(2SinaCosa)+SinaCosa*Sina/Cosa =Cos^2 a+Sin^2 a =1 4. Solve the equation Cos2a=3Sina+2，0
其他解答:CD51EBF2FDB84E83
maths
發問:
1. solve the equation log (x^3+1) =2.42. solve the equation log3x+logx9 =33. simplify (2sina cos^3a) /(sin2a) + sina cosa tana4. solve the equation cos2a=3sina+2 0
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最佳解答:1. Solve the equation log (x^3+1) =2.4 Sol x^3+1=10^2.4 x^3+1=251.1887 x^3=250.11887 x=6.3 2. Solve the equation log3_x+logx_9 =3 Sol Set log3_x=p p+2/p=3 p^2-3p+2=0 (p-1)(p-2)=0 p=1 or p=2 log3_x=1 or log3_x=2 x=3 or x=9 3. Simplify (2SinaCos^3 a)/(Sin2a)+SinaCosaTana Sol (2SinaCos^3 a)/(Sin2a)+SinaCosaTana =(2SinaCos^3 a)/(2SinaCosa)+SinaCosa*Sina/Cosa =Cos^2 a+Sin^2 a =1 4. Solve the equation Cos2a=3Sina+2，0
其他解答:CD51EBF2FDB84E83
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