(X+5X)+[(11-X)+7(11-X)]=76 具体..
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1
解方程:5x(x+7)(x+4)=5x(x的平方+11x)
5x(x+7)(x+4)=5x(x^2+11X)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
计算:1/(x^2-7x+10)+1/(x^2-x-2)+1/(x^2+5x+4)+1/(x^2+11x+28)=( )
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
已知2x*x+x-5=0,求代数式6x*x*x+7x*x-13x+11的值
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x的平方+5x+7=3x+11
解方程⑴ x/(2x^2-11x-21)=(x+7)/(x^2-12x+35)
x+4x+8=4x+11 x(2x-4)=5-8x解方程急!
7x-11=5x+27