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x(8%x)=9.75

x(8-x)=9.75 8x-x²-9.75=0 x²-8x+9.75=0 (x-6.5)(x-1.5)=0 x=6.5或x=1.5

x-4)/(x-5)=(x-5+1)/(x-5)=1+(1/(x-5)) 原方程装换为 1+(1/(x-5))+1+(1/(x-9))=1+(1/(x-8))+1+(1/(x-6)) 1/(x-5)+1/(x-9)=1/(x-8)+1/(x-6) 设x-7=y 1/(y+2)+1/(y-2)=1/(y-1)+1/(y+1) 2y/(y*y-4)=2y/(y*y-1) y=0,x=7

(x-4)/(x-5) + (x-8)/(x-9) = (x-5)/(x-6) + (x-7)/(x-8) (x-5+1)/(x-5) + (x-9+1)/(x-9) = (x-6+1)/(x-6) + (x-8+1)/(x-8) 1+1/(x-5) + 1+1/(x-9) = 1+1/(x-6) + 1+1/(x-8) 1/(x-5) + 1/(x-9) = 1/(x-6) + 1/(x-8) 1/(x-9) - 1/(x-8) = 1/(x-6)...

(x-8)/4=(x+9)/5 解:5(x-8)=4(x+9) 5x-40=4x+36 5x-4x=36+40 x=76 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

a+b=8 ab=9.75,a=9.75/b 所以:9.75/b+b=8 b^2-8b+9.75=0 (b-6.5)(b-1.5)=0 b=6.5 或 b=1.5 代入1式: a=8-6.5=1.5,或 a=8-1.5=6.5 所以:这两个数分别是6.5 和 1.5

x(8-x)=9.95 8x-x^2=9.95 x^2-8x+9.95=0 x=(8±√(8^2-4*9.95))/2 x=(40±11√5)/10 望采纳,谢谢!

9×8+8=(8)x(10)=(80)

解答如下:

解:x-9=64÷8 x=9+8 x=17

(x-4/x-5)-(x-7/x-8)=(x-5/x-6)-(x-8/x-9)(x-4)/(x-5)+(x-8)/(x-9)=(x-7)/(x-8)+(x-5)/(x-6) 1+1/(x-5)+1+1/(x-9)=1+1/(x-8)+1+1/(x-6) 1/(x-5)+1/(x-9)=1/(x-8)+1/(x-6) 1/(x-5)-1/(x-8)=1/(x-6)-1/(x-9) -3/(x^2-13x+40)=-3/(x^2-15x+54) x^2-...

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