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x÷x=2x,x是多少?

2X÷X=: 在x不等于0时:2X÷X=2 x等于0时,算式是不成立的。

x-2x/2-6÷(x-5/2-x-2) =x-x-6÷(-9/2) =-6*(-2/9) =4/3

运算过程: 列方程:x÷4=2x-3.5 解:x=(2x-3.5)×4 x=8x-14 8x-x=14 7x=14 x=2

(x3)²÷(-x)²+(-2x)³×(-x) =x^6÷x^2+2x^3×x =x^4+2x^4 =3x^4

【(x²-2x+1)分之x+(1-x)分之1】÷(x²-1)分之2 =[x/(x-1)²-1/(x-1)×(x+1)(x-1)/2 =(x-x+1)/(x-1)×(x+1)(x-1)/2 =(x+1)/2 当x=-2时 原式=(-2+1)/2=-1/2

2x+x=72 3×=72 ×=24

(x+40)+(x-40)+x÷2+2x=900, x+40+x-40+x/2+2x=900, (9/2)x=900, x=900×2/9, x=200

2x³÷x² =2x^(3-2) =2x^1 =2x

(x+2)/(2x²-4x )÷ [(x-2)+(8x/(x-2)] = [(x+2)/2x(x-2 )]÷ [(x-2)^2+8x]/(x-2) = [(x+2)/2x(x-2 )]*[(x-2)/(x+2)^2] =1/x(x+2) x=√2 -1. 原式=1/x(x+2) =1/[(√2 -1)(√2 +1)] =1/(2-1) =1

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