2/11÷1/9÷19/22 9/5x2/3÷1
2/11÷1/9÷19/22 9/5x2/3÷1
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x
化简x-1分之x+1-x2-1分之x2-2x÷x2-x-2/x2+2x+1
计算x2-1/x2次方-2x+1÷x2次方+x/x-1
已知x2 3x-2=0,求2x-4╱x2 6x 9÷(x-3)×x2-9╱2x-x2的值
(x2+3x+9)/(x2-27)+(6x)/(9x-x2)-(x-1)/(6+2x)
先化简,再求值:(x+2x2-2x-x-1x2-4x+4)÷x2-16x2+4x,其中x=2+3.
先化解,再求值:【1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)】/1/(x2+9x+20),
解方程:X2--1/8(X2+2X)+X2+2X/3(X2--1)=11
先化简再求值:(x-4/x2-1)÷(x2-3x-4/ x2+2x+1)+1/x-1.其中x=5
5x2-3+2÷5=
分式计算:2x/x2-x-2÷(1-x/x+1)-x2+2x/x2-4