.X²+13X+36 .X²+5X-20 .X²-2X-15 .8(X²+X)&
2x²+x
(x-2)(x-3)+2(x+6)(x-5)-3(x²-7x+13)化简
解方程.(5x/x²+x-6)+(2x-5/x²-x-12)=7x-10/x²-6x+8
f(x)=x²+3x|x-2|
化简{x²-2x分之x+2-x²-4x+4x分之x-1}除以X分之(x-1)(X-4)乘以(2-x)
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
[(x+2)/(x²+2x)-(x-1)/(x²-4x+4)]÷(x-4)/x
3x⁷*x⁴+2x*x²*x⁴-4x⁵*(-x)²
x(x²-1)+2x²(x+1)-3x(2x-5)计算
不等式|(x+3)/x|>(x+3)/x,不等式(x²-9)/(x-2)>0
十字相乘法x²-x-6 x²+x-6 x²-x-20 x²+6x+8 5x
x²/x-5+25/5-x