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(10點!!) Cramer's Rule

發問:

Use Cramer's Rule to solve the system for x,y,z. (cos?)x - (sin?)y = cos? - 2sin? (sin?)x + (cos?)y = sin? + 2cos?

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最佳解答:

回答在補充內容...................... 2010-09-07 16:07:39 補充: Use Cramer's Rule to solve the system for x,y,z (Cos?)x-(Sin?)y=Cos?-2Sin? (Sin?)x+(Cos?)y= Sin?+2Cos? D =|Cos? -Sin?| |Sin? Cos?|=Cos^2?+Sin^2 ?=1 Dx =|Cos?-2Sin? -Sin?| |Sin?+2Cos? Cos?| =(Cos?-2Sin?)* Cos?+(Sin?+2Cos?)*Sin? =1 2010-09-07 16:08:04 補充: Dy =|Cos? Cos?-2Sin?| |Sin? Sin?+2Cos?| = Cos? *(Sin?+2Cos?)-Sin?*(Cos?-2Sin?) =2 x=Dx/D=1/1=1 y=Dy/D=2/1=2

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