1.（x-3)÷2=7.5 2.3x+x=30 3.15x+x=40 4.2.5x-6=18.5 5.3x+7=59.2

1.（x-3)÷2=7.5 2.3x+x=30 3.15x+x=40 4.2.5x-6=18.5 5.3x+7=59.2 化简 [3x/(x+2)-x/(x=2)]÷x/(x^2-4)化简 [3x/(x+2)-x/(x-2)]÷x/(x^2-4 1.x²+3x/x²+2x -x²-4/x²+4x+4 2.a²/a+b-a+b 3.(1-1/a-2)÷3-a/2a-44.(x-1/y)÷（y-1/x) 5.3-x/x-4+1/4-x=1 6.x-2/x+2-1=3/x²-4 7.5/x-1=1/x+38.x+1/x-2+x+2/x-1=2 计算：1.y/4x²-1/12y²+1/6xy 2.3/x-6/1-x-x+5/x²-x3.x/x-y×y²/x+y-x四次方y/x四次方-y四次方÷x²/x²+y²解方程：1.x-1/（x-2）+1=1/2-x2.x+1/x-1-4/x²-1=13.1/x+3-2/3-x=1/x²-9 已知x=2π+1.求(X-1)+(X-2)+(X-3)+(X-4)+(X-5)+(X-6)+(X-7)+(X-8)+(X-9)+(X-10) X^2-3X-2=0,求( x - 2x-1/x )÷(x-1)/(x^2-2x) 1.x/9+x=62.x/x+1 + x+1/2x = 3 (X+1)X(X+2)X(X+3)=504 解方程：1.x/x+1-1=3/（x+1)(x-2) 2.3/x+2+1/x=4/x²+2x 3.2/3+x/3x-1=1/9x-3 x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4)2.2/3+x/(3x-1)=1/9x-3 2x^2-4x/x+2`x^2+2x/x^2-4x+4÷x/3x-6,其中x=根号3/2 2x^2-4x/x+2`x^2+2x/x^2-4x+4÷x/3x-6,其中x=根号3/2 一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X 1.(1/X-1 )-2=X^-3X/X^-12.（X/X+1)^+5(X/X+1)+6=03.（8(X^+2X)/X^-1）+ 3（X^-1)/X^+2x x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 化简求值：(3x/x+2-x/x-2)÷2x/x^2-4,x=-3 先化简再求值[3x/(x+2)-x/(x-2)]÷2x/(x^2-4)x=2010 x=根号3时,代数式（x/x-1-x/x+1)÷2x/1-x的值是?