已知:2x的平方+3x-1=0,
求:3x-1分之(2x的五次方+3x的四次方+3x的3次方+9x的2次方-5x+1)的值
人气:230 ℃ 时间:2020-05-19 21:34:26
解答
因为2x²+3x-1=0
故:3x-1=-2x²,1=2x²+3x,2x²=1-3x,2x²+3x =1,x≠0
故:(2x^5+3x^4+3x ³+9x²-5x+1)/(3x-1)
=(2x^5+3x^4+3x ³+9x²-5x+2x²+3x)/(-2x²)
=(2x^5+3x^4+3x ³+11x²-2x)/(-2x²)
=(2x^4+3x³+3x²+11x-2)/(-2x)
=[x² (2x²+3x) +3 x²+11x-2] /(-2x)
=[4x² +11x-2] /(-2x)
=[2(1-3x)+11x-2] /(-2x)
=5x/(-2x)
=-5/2
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