6x2-15=5x2怎么解答?
15X2/5X2/5X2/5=
方程7 / x2+x+ 3/ x2-x=6 / x2-x怎么解?
解分式方程:2/x2+5x+6 + 3/x2+x-6=4/x2-4
x2-5x+1=0则x2+x2/1
f(x2-2)=lg(x2/x2-5)
2+5x2+5x2=?
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x
max z=3*x1*x1-x1^3+5*x2*x2-x2^3; x1+2*x2=0; 刚接触lingo大家看看怎么不对
-5X2-6等于
x2+5x+6/2+4-x2/4+x2+x-6/3=0 解方程,检验!
1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=1/(x+4)
(x2+5x+2)(x2+5x+3)-12怎么因式分解 (x2)是x的平方,