3.14x(8÷2)÷2-3.14x(4÷2)÷2
x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4)
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
一元二次方程 (3.14×2x÷4)+x+(3.14x²÷x)+(3.14x²÷x-x)=15.7
计算:2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?
[(x+2)/(x²+2x)-(x-1)/(x²-4x+4)]÷(x-4)/x
(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)
先化简,再求值:[x+2/(x^2-2x)-(x-1)/(x^2-4x+4)]÷2x-8/(x^3-2x^2)
先化简再求值[3x/(x+2)-x/(x-2)]÷2x/(x^2-4)
3x/(x-2)-x/(x+2)÷2x/(x-4)化简
1.(1+2/X-X+1/X-2)÷X+4/X²-2X
先化简(x平方-4x+4)/(x平方-2x)÷(x-4/x)
x^2-x/x+1÷x/x+1 ;x^2+6x+9/x^2-9÷x+2/x-3;2/a÷4/a