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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

见图

x²-8x+9=0 (x-4)²=7=(√7)² 所以X=4±√7!

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

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!

解答如下:

(1)9.8÷x=14 9.8÷x×x=14×x 14x=9.8 14x÷14=9.8÷14 x=0.7(2)4.5÷x=0.03 4.5÷x×x=0.03×x 0.03x=4.50.03x÷0.03=4.5÷0.03 x=150(3)0.5x=6.30.5x÷0.5=6.3÷0.5 x=12.6(4)196÷x=28 196÷x×x=28×x 28x=196 28x÷28=196÷28 x=7(5)x÷34=2.7 x÷34×3...

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